Fixes #577
Fixes #449
updated docs  - typo
Merge branch 'master' of github.com:uikit/uikit
addons cover doc updated
added cover test
updated version and dists
updated docs - cover add-on
Merge branch 'master' of github.com:uikit/uikit

Conflicts:
	docs/addons_cover.html
dom observe docs updated
updated docs - cover add-on
Merge branch 'master' of github.com:uikit/uikit
Update README.md
tab.js cleanup