add rc/sass.kak
add rc/haml.kak
add rc/coffee.kak
add rc/cucumber.kak
add rc/scss.kak
add rc/rust.kak
add rc/ragel.kak
Merge some more language support from alexherbo2

 * alexherbo2/haml-rc
 * alexherbo2/cucumber-rc
 * alexherbo2/sass-rc
 * alexherbo2/scss-rc
 * alexherbo2/ragel-rc
 * alexherbo2/coffee-rc
 * alexherbo2/rust-rc