Unused bears show up in different categories (languages) on successive runs

[tallicamike]

On successive runs against coala repo, print_relevant_bears will display unused bears in different categories (languages) on each run. I think this is due to the fact that the filtering is done on a dictionary that is unordered (so on each run the values are eliminated in a different order, and for the values that belong to multiple categories/languages they might end up as flagged in different categories). This is blocked by #227.

[gitmate-bot]

GitMate.io thinks the contributor most likely able to help you is @satwikkansal.