Adding new attributes to IssueEvent (#857)

See Issue #855 

The class [IssueEvent](https://github.com/PyGithub/PyGithub/blob/master/github/IssueEvent.py) is missing a large number of attributes documented in the [API](https://developer.github.com/v3/issues/events/).

This is also commented about in #653 to a degree

27 of the tests 27 known event types have tests.

**Currently Tested using Issue #30**            
- [x] subscribed
- [x] assigned
- [x] referenced               
- [x] closed                   
- [x] labeled                  

**Currently Tested using Issue/PR #538**
- [x] merged
- [x] mentioned
- [x] review_requested

**Currently Tested using Issue/PR #857**
- [x] reopened
- [x] unassigned
- [x] unlabeled
- [x] renamed
- [x] base_ref_changed
- [x] head_ref_deleted 
- [x] head_ref_restored
- [x] milestoned
- [x] demilestoned
- [x] locked
- [x] unlocked
- [x] review_dismissed
- [x] review_request_removed
- [x] marked_as_duplicate
- [x] unmarked_as_duplicate
- [x] added_to_project       
- [x] moved_columns_in_project
- [x] removed_from_project
- [x] converted_note_to_issue - Note: this event is tied into Issue #866 

This PR is now ready to be merged

github/Consts.py

@@ -77,3 +77,6 @@
 
 # https://developer.github.com/changes/2018-02-22-label-description-search-preview/
 mediaTypeLabelDescriptionSearchPreview = "application/vnd.github.symmetra-preview+json"
+
+# https://developer.github.com/changes/2018-01-10-lock-reason-api-preview/
+mediaTypeLockReasonPreview = "application/vnd.github.sailor-v-preview+json"

github/Issue.py

@@ -397,7 +397,8 @@ def get_events(self):
             github.IssueEvent.IssueEvent,
             self._requester,
             self.url + "/events",
-            None
+            None,
+            headers={'Accept': Consts.mediaTypeLockReasonPreview}
         )
 
     def get_labels(self):

github/IssueEvent.py

@@ -101,6 +101,102 @@ def url(self):
         self._completeIfNotSet(self._url)
         return self._url.value
 
+    @property
+    def node_id(self):
+        """
+        :type: string
+        """
+        self._completeIfNotSet(self._node_id)
+        return self._node_id.value
+
+    @property
+    def commit_url(self):
+        """
+        :type: string
+        """
+        self._completeIfNotSet(self._commit_url)
+        return self._commit_url.value
+
+    @property
+    def label(self):
+        """
+        :type: :class:`github.Label.Label`
+        """
+        self._completeIfNotSet(self._label)
+        return self._label.value
+
+    @property
+    def assignee(self):
+        """
+        :type: :class:`github.NamedUser.NamedUser`
+        """
+        self._completeIfNotSet(self._assignee)
+        return self._assignee.value
+
+    @property
+    def assigner(self):
+        """
+        :type: :class:`github.NamedUser.NamedUser`
+        """
+        self._completeIfNotSet(self._assigner)
+        return self._assigner.value
+
+    @property
+    def review_requester(self):
+        """
+        :type: :class:`github.NamedUser.NamedUser`
+        """
+        self._completeIfNotSet(self._review_requester)
+        return self._review_requester.value
+
+    @property
+    def requested_reviewer(self):
+        """
+        :type: :class:`github.NamedUser.NamedUser`
+        """
+        self._completeIfNotSet(self._requested_reviewer)
+        return self._requested_reviewer.value
+
+    @property
+    def milestone(self):
+        """
+        :type: :class:`github.Milestone.Milestone`
+        """
+        self._completeIfNotSet(self._milestone)
+        return self._milestone.value
+
+    @property
+    def rename(self):
+        """
+        :type: dict
+        """
+        self._completeIfNotSet(self._rename)
+        return self._rename.value
+
+    @property
+    def rename(self):
+        """
+        :type: dict
+        """
+        self._completeIfNotSet(self._rename)
+        return self._rename.value
+
+    @property
+    def dismissed_review(self):
+        """
+        :type: dict
+        """
+        self._completeIfNotSet(self._dismissed_review)
+        return self._dismissed_review.value
+
+    @property
+    def lock_reason(self):
+        """
+        :type: string
+        """
+        self._completeIfNotSet(self._lock_reason)
+        return self._lock_reason.value
+
     def _initAttributes(self):
         self._actor = github.GithubObject.NotSet
         self._commit_id = github.GithubObject.NotSet
@@ -109,6 +205,17 @@ def _initAttributes(self):
         self._id = github.GithubObject.NotSet
         self._issue = github.GithubObject.NotSet
         self._url = github.GithubObject.NotSet
+        self._node_id = github.GithubObject.NotSet
+        self._commit_url = github.GithubObject.NotSet
+        self._label = github.GithubObject.NotSet
+        self._assignee = github.GithubObject.NotSet
+        self._assigner = github.GithubObject.NotSet
+        self._review_requester = github.GithubObject.NotSet
+        self._requested_reviewer = github.GithubObject.NotSet
+        self._milestone = github.GithubObject.NotSet
+        self._rename = github.GithubObject.NotSet
+        self._dismissed_review = github.GithubObject.NotSet
+        self._lock_reason = github.GithubObject.NotSet
 
     def _useAttributes(self, attributes):
         if "actor" in attributes:  # pragma no branch
@@ -125,3 +232,25 @@ def _useAttributes(self, attributes):
             self._issue = self._makeClassAttribute(github.Issue.Issue, attributes["issue"])
         if "url" in attributes:  # pragma no branch
             self._url = self._makeStringAttribute(attributes["url"])
+        if "node_id" in attributes:  # pragma no branch
+            self._node_id = self._makeStringAttribute(attributes["node_id"])
+        if "commit_url" in attributes:  # pragma no branch
+            self._commit_url = self._makeStringAttribute(attributes["commit_url"])
+        if "label" in attributes:  # pragma no branch
+            self._label = self._makeClassAttribute(github.Label.Label, attributes["label"])
+        if "assignee" in attributes:  # pragma no branch
+            self._assignee = self._makeClassAttribute(github.NamedUser.NamedUser, attributes["assignee"])
+        if "assigner" in attributes:  # pragma no branch
+            self._assigner = self._makeClassAttribute(github.NamedUser.NamedUser, attributes["assigner"])
+        if "review_requester" in attributes:  # pragma no branch
+            self._review_requester = self._makeClassAttribute(github.NamedUser.NamedUser, attributes["review_requester"])
+        if "requested_reviewer" in attributes:  # pragma no branch
+            self._requested_reviewer = self._makeClassAttribute(github.NamedUser.NamedUser, attributes["requested_reviewer"])
+        if "milestone" in attributes:  # pragma no branch
+            self._milestone = self._makeClassAttribute(github.Milestone.Milestone, attributes["milestone"])
+        if "rename" in attributes:  # pragma no branch
+            self._rename = self._makeDictAttribute(attributes["rename"])
+        if "dismissed_review" in attributes:  # pragma no branch
+            self._dismissed_review = self._makeDictAttribute(attributes["dismissed_review"])
+        if "lock_reason" in attributes:  # pragma no branch
+            self._lock_reason = self._makeStringAttribute(attributes["lock_reason"])

github/Repository.py

@@ -1925,7 +1925,8 @@ def get_issues_event(self, id):
         assert isinstance(id, (int, long)), id
         headers, data = self._requester.requestJsonAndCheck(
             "GET",
-            self.url + "/issues/events/" + str(id)
+            self.url + "/issues/events/" + str(id),
+            headers={'Accept': Consts.mediaTypeLockReasonPreview}
         )
         return github.IssueEvent.IssueEvent(self._requester, headers, data, completed=True)
 
@@ -1938,7 +1939,8 @@ def get_issues_events(self):
             github.IssueEvent.IssueEvent,
             self._requester,
             self.url + "/issues/events",
-            None
+            None,
+            headers={'Accept': Consts.mediaTypeLockReasonPreview}
         )
 
     def get_key(self, id):