Add examples for Repository as per PyGithub#874

doc/examples/Repository.rst

@@ -8,4 +8,43 @@ 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.title)
+ ...
+ How to get public events?
+ GithubException: 500 None when using get_issues
+ get_repo crashes with UnicodeEncodeError if log level..
+ Prevent .netrc from overwriting Auth header
+
+Get all the labels of the repository
+------------------------------------
+
+.. code-block:: python
+
+ >>> repo = g.get_repo("PyGithub/PyGithub")
+ >>> labels = repo.get_labels(state='open')
+ >>> for label in labels:
+ ... print(label.name)
+ ...
+ Hacktoberfest
+ WIP
+ bug
+ documentation