Merge pull request #121 from kagemusha/master

add a grunt-contrib-sass option since grunt-sass only allows SCSS style
Compile SASS files with .sass extension, not just .scss
Merge pull request #125 from mbixby/master

Compile SASS files with .sass extension, not just .scss
What may appear to some to be more idiomatic.
But works only due to a quirk in Ember.Router
add emblem.js option