Bug 753984 - added tests for an utterance order configurability. r=eeejay
Bug 753984 - added a preference for utterance order to make it configurable. Presenter context was moved to Utils and renamed to pivot context. Created a new method to generate utterance for pivot context. Moved context utterance generation from Pivot(Presentation) to UtteranceGenerator. r=eeejay
Bug 857984 - mach mochitest now colorizes and prints failure summary; r=Ms2ger

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extra : rebase_source : 97900c2bf0aaa83a3a9fa5e4dc88901140f66e60