Use only rebar.config

Rather than providing a mix.exs file for Mix and a rebar.config for Rebar, just use rebar.config and rely on Mix to correctly compile the Erlang code from that.

Fix version string under Mix

Correct a mixup between Erlang and Elixir's notion of "string"

Fix missing mix.exs file in release

Update the .app.src to include the mix.exs file

Dependencies and Elixir version

Update dependencies to work on Erlang/OTP 19 and add some code so that Mix generates a "git" version number like Rebar3.

Add Elixir interface

Adds a simple native-Elixir interface, so tab-completion should work and the module is capitalized.

Initial version

This version works and is ready to use. I'd like to add some more documentation and tests before marking it 1.0.0.

Hex testing 7

more of the same

Hex testing 6

More of the same

Hex testing 5

More of the same

Hex testing 4

More of the same