Fix variable name in generateHSM.
SoundButtonView uses HSM.
Big overhaul of the way sounds are added. Drag and drop is now optional.
Remove unnecessary newline in grid.scss.
Change "this.$el.find" to the Backbone shortcut "this.$".
Increase margin of instructions-panel.
Upgrade RequireJS from 2.1.0 to 2.1.2.
Upgrade Backbone from 0.9.2 to 0.9.10.
Upgrade jQuery from 1.8.2 to 1.9.0, and jQuery UI from 1.9.0 to 1.10.0.
Fix collection source button dimensions (take border into account).