Update gumby.tabs.js

this fixes nested tabs
Update README.md

Added note about using 1.0.6 modular scale if you are installing it via a gem.
Update _entypo.scss

Replace raw glyphs with character entities
Compile Sass
Compile Gumby JS
Note regarding changelog in README
Bump bower.json version number
Compile Gumby JavaScript
Bump Bower version number
Merge branch 'hotfix/2.6.3' into develop

Conflicts:
	bower.json