structure for tree and filemanager patterns
fix height of month/year selector fixes #161
removing coverage instrumenting files for "test-chrome"
auto add link on upload and add text so users know they can drag and drop closes #141
add tree pattern docs and implementation
backdrop on specified element to prevent toolbar shrink issues
avoid overriding render() in button
use columns icon for column menu
tooltips on buttons
Modal: add formFieldError option, use it for dexterity err. msg bug workaround
Fix a typo in default behaviour test's name
Modal docs: add description of a new option formFieldError