[Merge] lp:~brendan-donegan/phablet-tools/citrain-diff into lp:phablet-tools

[♫ Robert Bruce Park ♫]

Review: Approve

Hey, this code is pretty good. I see short functions with few args each and i like it.

My only concern is that i saw os.chdir() used and I've just gone through a long nightmare of refactoring code that used it poorly. It would probably be better if you passed in the cwd argument to Popen rather than chdir around. I know it's somewhat trivial in this case since you only call it once, so feel free to ignore me... Just my personal preference.
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https://code.launchpad.net/~brendan-donegan/phablet-tools/citrain-diff/+merge/241675
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