Rewrites Ririsu in Elixir. (#6)

Elixir supports proper unicode in character lists out of the box, and has some
other nice additions. This project now uses Mix to automate stuff.

--HG--
extra : amend_source : 55b56c1db62bf53d64d19602ce14d635ecf2ab08
Added tag 0.4.0 for changeset a40e0877e199
Merge.