Add Support for Elixir

[heri16]

We need to add support for Elxiir "via-tuple" ProcessRegistry API.
Note: Gproc already supports this, making usage easier in Elixir without introducing another wrapper.

Example Target Usage:

GenServer.start_link(My.GenServer.Module, [], [name: {:via, :syn, "my-key"}])
GenServer.cast({:via, :syn, "my-key"}, :message)
GenServer.call({:via, :syn, "my-key"}, :message)

[heri16]

Created a pull request #18

[Roberto Ostinelli]

This is not Elixir-specific. Closing, continuing in the PR.