edx/diff-cover — pull request #57 by wedaly (2013-12-24 15:27:51+00:00)
Title: Fix unicode error for pregenerated reports

This is the same error as the previous PR. In that PR, I fixed unicode handling when calling pylint/pep8 directly. However, I did not fix the error for when `diff-quality` loads a pre-generated report from a file.

This PR does the same thing as the other fix: decode the file input as unicode, with error mode set to replace.
I also cleaned up the unit tests a bit.