Support for WebP, default quality for JPG (90%, which may or may not be equivalent to Photoshop's level 8), and using the pixel depth from the pixmap rather than hardcoding it
added unit tests for webp, modified jshint rule in grunt to catch test files, added underscore to exported functions that are only used in unit tests
Merge pull request #46 from adobe-photoshop/dk/webp-support

WebP support, and a default quality for JPG