Add a location property to the entities

Build the location, based on its kind location and their uuid

ooi/occi/core/entity.py

@@ -91,3 +91,7 @@ def title(self):
     @title.setter
     def title(self, value):
         self.attributes["occi.core.title"].value = value
+
+    @property
+    def location(self):
+        return helpers.join_url(self.kind.location, self.id)

ooi/occi/helpers.py

@@ -30,3 +30,9 @@ def check_type(obj_list, obj_type):
 
     if not all([isinstance(i, obj_type) for i in obj_list]):
         raise TypeError('object must be of class %s' % obj_type)
+
+
+def join_url(prefix, remainder, fragments=None):
+    if fragments:
+        remainder = "%s#%s" % (remainder, fragments)
+    return urlparse.urljoin(prefix, remainder)