Add examples for Repository as per #874 (#917)

doc/examples/Repository.rst

@@ -8,4 +8,44 @@ Get repository topics
 
     >>> repo = g.get_repo("PyGithub/PyGithub")
     >>> repo.get_topics()
-    [u'pygithub', u'python', u'github', u'github-api']
+    [u'pygithub', u'python', u'github', u'github-api']
+
+Get count of stars
+------------------
+
+.. code-block:: python
+
+    >>> repo = g.get_repo("PyGithub/PyGithub")
+    >>> repo.stargrazers_count
+    2086
+
+Get list of open issues
+--------------------------
+
+.. code-block:: python
+
+    >>> repo = g.get_repo("PyGithub/PyGithub")
+    >>> open_issues = repo.get_issues(state='open')
+    >>> for issue in open_issues:
+    ...    print(issue)
+    ...
+	Issue(title="How to get public events?", number=913)
+	Issue(title="Prevent .netrc from overwriting Auth header", number=910)
+	Issue(title="Cache fetch responses", number=901)
+	Issue(title="Is suspended_users for github enterprise implemented in NamedUser?", number=900)
+	Issue(title="Adding migration api wrapper", number=899)
+
+Get all the labels of the repository
+------------------------------------
+
+.. code-block:: python
+
+    >>> repo = g.get_repo("PyGithub/PyGithub")
+    >>> labels = repo.get_labels()
+    >>> for label in labels:
+    ...    print(label)
+    ...
+    Label(name="Hacktoberfest")
+    Label(name="WIP")
+    Label(name="bug")
+    Label(name="documentation")