fix jshint errors in test/run.js
merge boost into juice

See https://github.com/superjoe30/boost

 * legacy `juice` function still works as is
 * add `juice(filePath, [options], callback)`
 * add `juice.juiceDocument(document, options, callback)`
 * add `juice.juiceContent(html, options, callback)`
 * remove `juice.juiceDom`

Closes #16.
Merge pull request #23 from LearnBoost/boost

merge boost into juice