add support for project deploy keys

gitlab.py

@@ -485,6 +485,7 @@ def protect(self, protect=True):
     def unprotect(self):
         self.protect(False)
 
+
 class ProjectCommit(GitlabObject):
     _url = '/projects/%(project_id)d/repository/commits'
     canGet = False
@@ -493,6 +494,11 @@ class ProjectCommit(GitlabObject):
     canCreate = False
 
 
+class ProjectKey(GitlabObject):
+    _url = '/projects/%(project_id)d/keys'
+    canUpdate = False
+
+
 class ProjectHook(GitlabObject):
     _url = '/projects/%(project_id)d/hooks'
 
@@ -602,6 +608,11 @@ def Hook(self, id=None, **kwargs):
                                      project_id=self.id,
                                      **kwargs)
 
+    def Key(self, id=None, **kwargs):
+        return self._getListOrObject(ProjectKey, id,
+                                     project_id=self.id,
+                                     **kwargs)
+
     def Issue(self, id=None, **kwargs):
         return self._getListOrObject(ProjectIssue, id,
                                      project_id=self.id,