Create documentation and method stubs for issue #49 (legacy search api)

github/Github.py

@@ -64,3 +64,12 @@ class Github( object ):
             headers,
             data
         )
+
+    def search_repos( self, keyword ):
+        pass
+
+    def search_users( self, keyword ):
+        pass
+
+    def search_user_by_email( self, email ):
+        pass

github/Repository.py

@@ -1002,6 +1002,9 @@ class Repository( GithubObject.GithubObject ):
             None
         )
 
+    def search_issues( self, state, keyword ):
+        pass
+
     @property
     def _identity( self ):
         return self.owner.login + "/" + self.name