Attempt to fix broken build

For now this means no more Python 2.6 support (it doesn't have
`subprocess.check_output` and doesn't support `assertRaises` as a
context manager).

Author: msiemens

.travis.yml

@@ -2,10 +2,10 @@ sudo: false
 cache: pip
 language: python
 python:
+  - "3.5-dev"
   - "3.4"
   - "3.3"
   - "2.7"
-  - "2.6"
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
   # Setup of Git environment

PyGitUp/gitup.py

@@ -97,7 +97,7 @@ def get_git_dir():
     if os.path.isdir(git_dir):
         return abspath
     else:
-        return execute('git rev-parse --show-toplevel')
+        return execute(['git', 'rev-parse', '--show-toplevel'])
 
 
 class GitUp(object):

README.rst

@@ -59,10 +59,10 @@ to either:
 
 Otherwise pip will refuse to install ``git-up`` due to ``Access denied`` errors.
 
-Python 3 compatibility:
-~~~~~~~~~~~~~~~~~~~~~~~
+Python version compatibility:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Python 3.3 and 3.4 are supported :)
+Python 2.7, 3.3 and 3.4 are supported :)
 
 Options and Configuration
 -------------------------

tests/test_git_not_in_path.py

@@ -23,10 +23,12 @@ def test_not_a_git_repo():
     environ = os.environ.copy()
     os.environ['PATH'] = ''
 
-    with assert_raises(GitError) as e:
-        from PyGitUp.gitup import GitUp
-        GitUp(testing=True)
+    try:
+        with assert_raises(GitError) as e:
+            from PyGitUp.gitup import GitUp
+            GitUp(testing=True)
 
-    assert e.exception.message == "The git executable could not be found"
+        assert e.exception.message == "The git executable could not be found"
 
-    os.environ.update(environ)
+    finally:
+        os.environ.update(environ)