css fix
update UI
new demo
optimised JS
Revert "optimised JS"

This reverts commit 7c3d3eed4787136a278ba7404a9d5b67d26d4055.
remove extra 'div'
add extra alert
switched to UI-Bootstrap
update demo status
update demo status
New demo: checkbox group [custom directive]
Merge remote-tracking branch 'origin/gh-pages'