Use jshint, clean up tests r=mikedeboer

[lambdabaa]

• Fixes #103
• Fixes #104 by configuring jshint and adding make task
• Fixes #105 by specifying node <0.11 in npm engines

[lambdabaa]

@mikedeboer Can you take a look and also turn on your travis endpoint? See https://travis-ci.org/profile/mikedeboer and toggle the little radio button for mikedeboer/jsDAV

[mikedeboer]

I kind of like the style changes, except the === ones. I understand why it's promoted by JSHint, but we're smart enough to not shoot ourselves in the foot with such obvious things.

I'd actually prefer to take a JSHint configuration that yields as few warnings as possible and work from there.

[mikedeboer]

Sorry if I sound like a jerk, but could you also just revert the == to === changes you made?

Everything else, except the question about the bitwise operator change, looks good to me! Thanks for working on this!