Remove unused variable
Correct auto-mode-alist regexps
Use define-derived-mode to define elixir-mode
Merge branch 'bbatsov-auto-mode-alist'
Merge pull request #69 from bbatsov/remove-unused-option

Remove unused variable
Merge pull request #70 from bbatsov/master

Use define-derived-mode to define elixir-mode
Well, it's working. But it's max power.
WIP