Shorten local variable for syntax table.
Refactor elixir-font-lock-defaults.

This work was based off what I saw being done in both puppet-mode and python-mode.
Add failing test for indentation issue. Refs #59
Remove unused code.
Colorize operators when using dark background.
Merge pull request #60 from elixir-lang/syntax-table

Refactor font face defaults.
Update list of builtin modules.