Demos: Added class ui-filterable to filter listview example.
Filterable: Increased specificity to make margin override work regardless CSS file order.
Collapsible: Consistency in the padding and margin values we use across widgets.
Listview: Same spacing at all sides for inset listview inside a collapsible.
Filterable: Border styling of listview with filter inside collapsible.
Filterable: Margin settings for filterable search input inside collapsible.
Filterable: Allow class ui-filterable on both form wrapper and listview for convenience.
Demos: Updated filterable page to reflect latest changes.
Textinput: Use toggleClass for options corners and mini.