standalone sprockets support
Merge pull request #801 from aderyabin/sprockets_standalone

standalone sprockets support
doc: compass install -r #229
Sass: explicitly set $bootstrap-sass-asset-helper

Remove reliance on a hack as a polyfill for `function-exists`.
Remove clutter from the generated variables template.
rake convert
fix escaping
rake convert
rake convert
Provide the minified JS bundle as well #777
converter: support for twbs/bootstrap#15074 fix
rake convert
woff2 support
rake convert