Update to latest jQuery and underscore.
Update to latest Bootstrap.

Remove deprecated .box-shadow() calls, remove now-unnecessary keys.css.
Clean up styles compilation.
A bit of styles cleanup.
Clean up watch, livereload in gulp.
Coffeescript all the things!
Ignore npm-debug.log
Only copy images which have changed.
Update watch tasks with all dependencies.
Suppress line length complaints in json.coffee