Beginning Erlang EUnit Integration

In making this work, I got rid of the `exec-async` stuff.  So this should resolve #49.

- We still need to modify how EUnit formats its output.  
   - I think that `eunit_surefire.erl` in the core language can be used as a guide: 
     https://github.com/arnaudsj/erlang-eunit/blob/master/src/eunit_surefire.erl

- Erlang is as slow as java to boot its runtime