Updated jQuery to v2.1.0, maintenance and fixes issue #94 & #87

Updated jQuery to v2.1.0, removed need for jQuery-UI.
Updated the Stanford Javascript Crypto Library to the latest version and use it for AES instead of the big slow original AES implementation.
Updated .bind's to .on's.
Used vanilla JS in content.js so no need to include jQuery into "content_scripts" in manifest.json.
Fixed response.hasField bug which crashed when no password field exists.
Fixed the issue I reported (#94).
Also addresses Issue #87; feel free to revert this change and make it so that all password fields get overwritten if you prefer though...
Removed onclick() handlers from popup.html, goes against security policy & they were duplicated event handlers.
General code maintenance, random bug fixes and formatting.