Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/doc/ale-elixir.txt

@@ -0,0 +1,44 @@
+===============================================================================
+ALE Elixir Integration                                     *ale-elixir-options*
+
+
+===============================================================================
+mix                                                            *ale-elixir-mix*
+
+g:ale_elixir_mix_options                             *g:ale_elixir_mix_options*
+                                                     *b:ale_elixir_mix_options*
+  Type: |String|
+  Default: `'mix'`
+
+
+  This variable can be changed to specify the mix executable.
+
+===============================================================================
+mix_format                                              *ale-elixir-mix-format*
+
+g:ale_elixir_mix_format_options               *g:ale_elixir_mix_format_options*
+                                              *b:ale_elixir_mix_format_options*
+  Type: |String|
+  Default: `''`
+
+
+  This variable can be changed to specify the mix options passed to the
+  mix_format fixer
+
+===============================================================================
+dialyxir                                                  *ale-elixir-dialyxir*
+
+Dialyzer, a DIscrepancy AnaLYZer for ERlang programs.
+http://erlang.org/doc/man/dialyzer.html
+
+It can be used with elixir through dialyxir
+https://github.com/jeremyjh/dialyxir
+
+Options for dialyzer are not configurable by ale, but they are instead
+configured on your project's `mix.exs`.
+
+See https://github.com/jeremyjh/dialyxir#with-explaining-stuff for more
+information.
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl: