Support to Elixir language
Support to Elixir language

Was add support to [Elixir](https://elixir-lang.org/) with plugins

* alchemist
* vim-elixir

Also add `neomake` to run assync commands (elixir credo use it) and
`vim-test` giving support to many test frameworks into many languages.

paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles,paulopatto/dotfiles