Fixed a bug that would cause combined reports to always be 100% covered

Conflicts:
	diff_cover/violations_reporter.py
Merge pull request #45 from edx/will/fix-combined-input-bug

Fixed a bug that would cause combined reports to always be 100% covered
Incremented to v0.2.2, updated CHANGELOG
Merge branch 'master' into will/src-snippets

Conflicts:
	CHANGELOG
	diff_cover/violations_reporter.py