Add elixir language support

compiler/exunit.vim

@@ -0,0 +1,24 @@
+" Vim compiler file
+" Language:     ExUnit
+" Maintainer:   Rein Henrichs <rein.henrichs@gmail.com>
+" URL:          https://github.com/elixir-lang/vim-elixir
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "exunit"
+
+if exists(":CompilerSet") != 2    " older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+CompilerSet makeprg=mix\ test
+CompilerSet errorformat=%A\ \ %.)\ %m(%.%#),%C\ \ \ \ \ **%m,%C\ \ \ \ \ \ \ %m,%Z\ \ \ \ \ at\ %f:%l,%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim: nowrap sw=2 sts=2 ts=8: