Versioning

This is a new feature that allows automatic versioning of .css and .js files. This is necessary since some proxies and browsers don't take in account cache settings passed in the header (etag, last-modified, ...).
The version number will change automatically if any change is detected in the crunched file (no need to increment manually the version number).

This feature is available through Cruncher's helpers: @CruncherBundler.RenderCSS(false, null, true, "style.css", "style.less", "style.scss")