Bug 1033387 - Update JSBeautify and move it into toolkit r=fitzgen

--HG--
rename : browser/devtools/shared/Jsbeautify.jsm => toolkit/devtools/jsbeautify/beautify.js
Bug 994732 - Make "Disable Cache" in Devtools persist (only when the toolbox is open) r=jwalker, r=pbrosset
Bug 1035106 - Add new APIs to DOMUtils: colorToRGBA, isValidCSSColor & cssPropertyIsValid r=bz