Make sure all Erlang parameters are extracted and parsed in elixir.bat
Added parameter validation in the elixir.bat file

The batch file now allows both erlang and elixir commands before the ".ex" file; if any unknown parameter is passed before the ".ex file", an error is thrown.
Removeved the echo prefix from the elixir.bat file

Inline editing in github is dangerous!
Merge pull request #1269 from ToJans/master

On Windows Erlang parameters were not getting passed to elixir.bat in a proper way