add limited time label to shamrock
remove unused font-awesome css
tweak custom preview's tagline
remove inline style for sponsor on cerulean
add code modals on previews
add alert about html snippets
ignore bower_components and package.json for bower, closes #226
add buttons to input groups on test
add lumen to test
lumen: fix add-on button heights, closes #227
add link to bootstrapcdn
lumen: set pagination active background color, closes #228
lumen: darken navbar default brand color
flatly: tweak padding of navbar-brand
flatly: change input border color from green to blue
amelia, cerulean, flatly: tweak dropdown divider and header
Revert "amelia, cerulean, flatly: tweak dropdown divider and header"

This reverts commit d4626f2e8ef5806019b445ff0d14d32bba58a994.
add test case for alert anchor close button
fix alert close button style, closes #229
add dialog components to previews