issue #26: Add keyboard-accessible way to expand/collapse widget form controls
issue #22: Add support for deleting widgets - for real-o this time
issue #22 & #26: fixing coding standards issues
issue #22 redux: a simpler more elegant way of handling the removal of widgets, placing the control in the sidebar controller, as opposed to the individual widget controller
Put deleted widgets into the trash (wp_inactive_widgets sidebar)
Turn widget Delete link into Remove link w/ tooltip
Add support for deleting widgets in customizer

Add keyboard-accessible way to expand/collapse widget form controls

Merge branch 'issues-22-26' into develop

Closes #30
Fixes #22
Fixes #26