Basic modal scss and example markup in ui.html
0s transition not needed on .content, .overlay. Transition on .active does the trick
Abstracted drawers and modals into _toggles partial
Indentation correction on toggles partial
Added height 100% to body, html to fix % height issue in FF
Revert back to z-index after no go with FF
Remove !important from z-index in failed attempt to fix FF
tweaks to toggles.scss and some new settings