Add support for processing CSS files to replace image urls with cachable urls
Update README to include quote from Steve Souders from HTML5DevConf explaining jac's purpose
be strict
JSHint - use PascalCase for constructors
key should be root-relative url
fixes #2, removes querystring from path and injects digest into directory
JSLint fixes
avoid replacing external image references in CSS
fix error messages, logic error and reference to deprecated module function.
ignore data-uris in CSS processing
fix status string for singular/plural
Remove mtime in digest
Merge branch 'master' into feature/css

Conflicts:
	CHANGELOG.md
	package.json
	src/digester.js
Add https to test cases
Allow same file to be processed multiple times using same jac config (idempotence)
Support adding a host to manifest
refactor CDN support
clean up exposed modules
use a regular require() to support more elaborate config inputs
Update travis to test against node 0.10