[UPDATE] Bump to 2.0.0.beta1
[CS] Restart Celluloid between specs more cleanly

This will restart the thread pool properly on 0.15
[CS] Cleanup unnecessary spec duplication
[BUGFIX] Do not double-import Rayo nodes from presence stanzas
[BUGFIX] Handle presence stanzas which are not rayo events cleanly

Avoid parsing them at all by searching only for nodes in a rayo namespace
[DOC] Cleanup the changelog
[CHANGE] Remove `media_engine` and `default_voice` settings

These can be passed as options in Rayo commands and are not generic to all Rayo servers as settings.
[UPDATE] Bump to 2.0.0.beta2
[CS] Allow rbx build to fail on CI
[UPDATE] Bump to 2.0.0
[DOC] It's 2013
Merge branch 'release/2.0.0' into develop