Update ruby syntax

Update erlang provider to vim-erlang/vim-erlang-runtime, closes sheer…

…un#76

Change haskell provider to neovimhaskell/haskell-vim, closes sheerun#75

Update yajs syntax

Add groovy syntax, closes sheerun#74

Remove highlighting of reserved words in javascript

Better support for es6 syntax

Faster build (download archives instead of cloning)

Update

Add julia and ragel syntax