Update Browserify to 2.x

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The changes from Browserify 1.x to 2.x are rather substantial; of note, node-tagify is unmaintained,
and no longer supported on 2.x ... I'll have to find another solution. Might be hairy.

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There've been some issues with Browserify 2.x not supporting CoffeeScript directly, and Testling not using the Cakefile to execute tasks. @substack's told me to investigate the "html" and "preprocess" sub-fields in my package.json. Apparently, the HTML, when loaded into the browser, needs to output TAP with console.log; I'm sure this can be wrangled somehow with Mocha.

I searched GitHub for projects already using these (undocumented.) features, so I'll be implementing this in my own package.json soon. (Looks like #10 is also relevant here; simple scripts would be easier to integrate into Testling than cake tasks.)