Best keyboard accessibility

- Dropdown button keyboard accessibility
- Nav menu (dropdown) keyboard accessibility
Better keyboard accessibility

Second shot with the good coffeescript file this time :)
added variable
Merge pull request #51 from CreativeJuiz/master

Better keyboard accessibility
improved keyboard accessibility for navigation elements (nav menus & dropdown buttons)
restricted tab click binding to named anchor links -- fixes #50
added prevent default to disabled tabs, fixed hover state for active vertical tabs
added ability to open modals in fullscreen mode - fixes #53
tweaks to modals
.gitignore