Use GitPathTool in Snippet class
Fix snippet tests
Use relative path rather than absolute path
Merge branch 'master' of https://github.com/edx/diff-cover into fix-snippets-relative-path

Conflicts:
	diff_cover/snippets.py
	diff_cover/tests/test_snippets.py
Fix future import
Fix future import in snippet tests
Style changes
Decode six binary type in git_path
Fix build for python3
*Decode all occuring strings in git_path.py
Add integration test for running diff-cover from subdir
Add missing fixtures
Change docstring format to the one used in the project
Add console integration test for running diff-cover from subdir
Remove debug code
Remove unused print
Make GitPath signgleton
Remove forgotten prints
Add support for Pyflakes quality violations: eg. diff-quality --violation=pyflakes
Add pyflakes to requirements.txt
Add pyflakes to README

CI skip