gave -x permission to bin/www

for running as a scrip on *nix shells
rebuilt jquery min and map files
rewrote layout.jade in jade-only

* also made small changes to sign-in/sign-up modals
* added (required) flat-ui checkbox script
* now using latest jquery from
  34389c541b7f585a53cd209468b85817f4d13bde
removed unused js

most of these files came with the outdated and badly packaged flat-ui
bundle which was replaced in 4a11bb62046ae93730cd9ed41742e181010ff118
and b6eb362aa2a7eb9f29a611b328b08ae91f4a1f4c and were unused
if we need any of these files later, we'll add fresh copies