Remove top and bottom padding from .bkv_main
Remove arbitrary top-padding from .bkv_menu in lg and xl
Update README; ids -> classes
Merge branch 'release-0.3' into develop
Organize into test/ src/ example/
Move the responsibility of supplying images to user

We just need to deal with the style attributes like height and width, but
the actual images should be user supplied as they'll likely be
theme-dependent.
Jasmine tests
Cross-browser class remove/add
Merge branch 'crossbrowser-class-functions' into develop