Merge pull request gitpython-developers#16 from mike-perdide/master

improved comparison between Object instances to check for compatibility of the other side first. Previously, and exception would be thrown.
This adds convenience in an area which probably is not performance critical.

Author: Byron

git/objects/base.py

@@ -77,10 +77,14 @@ def _set_cache_(self, attr):
 
 	def __eq__(self, other):
 		""":return: True if the objects have the same SHA1"""
+		if not hasattr(other, 'binsha'):
+			return False
 		return self.binsha == other.binsha
 
 	def __ne__(self, other):
 		""":return: True if the objects do not have the same SHA1 """
+		if not hasattr(other, 'binsha'):
+			return True
 		return self.binsha != other.binsha
 
 	def __hash__(self):