Filterable: Prevent form submission when user presses ENTER

Intercept ENTER on keydown and keypress, preventing default

Fixes gh-7240
Build: Upgrade grunt-hash-manifest version to 0.5.1

MANIFEST was containing incorrect hashes
Toolbar: Stop using deprecated event in fixed persistent demo

Closes gh-7200
Fixes gh-7085
Build: Update release script for new jquery-release API

Closes gh-7257
Authors: Update
Demos: Added CasperJS functionnal tests