* boilerplate for category attribute
* style tweaks for Travis
* I read up on valid-jsdoc
* add to horizontal as well
* categories for vertical/event
* categories for vertical/data
* categories for vertical/control
* categories for vertical/looks
* categories for vertical/more
* categories for vertical/motion
* categories for vertical/operators
* categories for vertical/pen
* categories for vertical/senising
* rename Blockly.Categories.sounds to Blockly.Categories.sound
* add categories for vertical/sound
* categories for horizontal/control
* categories for horizontal/event
* categories for horizontal/wedo -- based off of color instead of adding wedo category
* Update all assets from Carl
* Update when-broadcast-received and dropdown sizes
* Update icon menu sizing
* Update padding on drop-down div
* Update WeDo and event blocks; defaults
* Update multi_playground and vertical_playground
* Recompile with CSS updates
* Updating default icon reference for wedo_motorspeed
* Icon menu and drop-down stubs
* Recompile 4/15
* Fix stubs to draw shadow block for drop-down
* Fix rendering of shadow for icon menu
* Add arrow to dropdown button
* Add drop-down buttons to rest of examples
* Implementation of drop-down div including positioning
* Drop-downs take colours from the blocks
* Fix scaled secondary position of drop-downs
* Fix arrow positioning for RTL
* Use SVG parentNode for sizing dropdown
* Use transform for drop-down positioning
* Add basic DropDownDiv hide
* Add animation-in to dropdown
* More subtle drop-down animation and shadow
* Add icon menu example
* Use options style of Blockly FieldImage for drop-down
* Add default value for iconmenu
* Add example hover, active states for iconmenu buttons
* Update dropdown_icon example
* Implement icon-menu value handling and default value
* Add updating the parent block image field to dropdown
* Drop-down animates out; add hooks to hide for various Blockly happenings
* Add pointer cursor for drop-down icons
* Improve documentation for drop-downs and minor refactor
* Factor out getSrcForValue in iconmenu
* Blocks take on the icon of their icon-menu
* Add basic accessibility properties, similar to closure
* Remove extra drop-down example; update playgrounds
* Remove unnecessary colour overrides
* Add onHide, colour changing, fix references in dropdowndiv
* Flip arrow when the drop-down is rendered above
* Hide the icon menu drop-down on second tap of button
* Add preventDefault to button ontouchstart
* Updates to drop-down from Carl
* Add icon-menu placeholders and a crazy demo
* Fix naming to normalize (drop-down, DropDown)
* Add license header
