Add code quality tools about opentype.js HOT 6 CLOSED

Commit 8e60c84 makes opentype.js JSHint-clean.

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For stylistic validation, JSCS seems like a good choice.

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We now run JSCS together with JSHint.

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hey, how about adding tools like mocha and chai, and then starting making unit tests when new features added? :)

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@oriSomething You're right! This is long overdue.

This reason why we haven't done this is because it all starts with bytes, and making unit tests that say: "here's this unreadable byte-stream, will this match up with this data structure" makes them defeat the purpose, I think.

It would be useful to catch regressions this way, though.

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i totally understand you. i'm not a big fan of TDD in new projects, but at this time of the project it can start to be useful, and make adding new features much easier.
if it's not something that needed now, i can scaffold the base of having the ability to use unit testing easily, and after this we can add more and more tests with time. but it will be more like in 3-5 weeks 'til i can sit on it.

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