Add support for Erlang

[slaykovsky]

Hi! Please add Erlang support for your awesome package ^_^

[rgbkrk]

⭐

Is there an Erlang language pack for Atom that people are relying on? atom-script relies on Atom's grammar list and name structure and Erlang isn't built in (yet). How's this one:

https://github.com/jonathanmarvens/atom-language-erlang

My mac is busily installing Erlang right now so I can actually tinker with this.

We only need two command/arg setups both of which are expected to produce output to stdout and stderr:

• Command that takes arbitrary text
  (e.g. python -c 'print("hi")')
• Command that takes a file
  (e.g. python test.py)

[slaykovsky]

There is no such simple as python. It will be good to just open Erlang REPL in module location as Emacs do.

[slaykovsky]

Hi!
I wrote this to grammars.coffee:

Erlang:
    command: "erl"
    "Selection Based": (code) -> ['-noshell -eval', code +", init:stop()."]

Then, I did:

apm update

in my term.
And then, when I trying to evaluate selected text, I get this:

[slaykovsky]

Wow, sorry for abusing this issue, but I did it! ^_^ Now it's working – Selection based evaluation. Now I'll try to do pull request :)