Added Support For Elixir (via elixirKeyword)

end keyword now works for the elixirKeyword syn
(set by vim-elixir plugin @ https://github.com/elixir-lang/vim-elixir)
Updated endwise_pattern to match elixir endwise_words

I forgot to update this piece, and it was the same as ruby
Merge pull request #36 from richsoni/add_elixir_support

Added Support For Elixir (via elixirKeyword)