cleanup elixir-mode structure
remove test.ex because it's not up to date with current elixir version syntax
use correct function prefix for elixir test function
autoload helper functions, simplify version display
fix *.elixir file ending elixir-mode autload
add elixir-mode documentation
update README with information about elixir-mode
add release rake task
Merge pull request #17 from elixir-lang/refactor-elixir-mode

Refactoring and clean up elixir-mode