Improve comformance to pep8 (+dos2unix)

PyGithub is now a public projects with several public contibutors,
I have to abandon my very personal coding conventions.

github/InputFileContent.py

@@ -11,12 +11,13 @@
 
 # You should have received a copy of the GNU Lesser General Public License along with PyGithub.  If not, see <http://www.gnu.org/licenses/>.
 
-class InputFileContent( object ):
-    def __init__( self, content ):
+
+class InputFileContent(object):
+    def __init__(self, content):
         self.__content = content
 
     @property
-    def _identity( self ):
+    def _identity(self):
         return {
             "content": self.__content,
         }