Use elixir 1.3.2 in travis

Remove elixir 1.4.0 warning in mix.exs

Replace to_existing_atom for to_atom

Add support for empty nested include on serializer

Add id field in attribute transform as binary instead of atom

Allow always_includes with nil or empty include param

Support atom and other format for dasherized data transformer

Update credo to 0.4.1

Remove link in H1

Add description in mix.exs

Improve README.md with a few tweaks (#2)

Add image

Rename JsonapiKit to Solage

Update Readme

Add travis badge in the Readme