Merge branch 'py2n3'

* python 3 compatibility
* all tests work in py2.6, 2.7, 3.3, 3.4

Author: Byron

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "async"]
-	path = gitdb/ext/async
-	url = https://github.com/gitpython-developers/async.git
 [submodule "smmap"]
 	path = gitdb/ext/smmap
 	url = https://github.com/Byron/smmap.git

.travis.yml

@@ -3,6 +3,16 @@ python:
   - "2.6"
   - "2.7"
   - "3.3"
+  - "3.4"
   # - "pypy" - won't work as smmap doesn't work (see smmap/.travis.yml for details)
 
-script: nosetests
+git:
+  # a higher depth is needed for one of the tests - lets fet
+  depth: 1000
+install:
+  - pip install coveralls
+script: 
+  - nosetests -v
+after_success:
+  - coveralls
+