add Scala support to prism
Merge pull request #256 from jozic/add-scala

add Scala support to prism
Simple start for Rip

Recognize comment, builtin, boolean
Recognize boolean, date, time, datetime, number
Recognize regex, symbol, string (crudely)
Recognize keywords
Recognize character
Recognize punctuation and reference

FIXME Input `<` inserts `;` after `<`