Fix attribute name in apikey migration
Merge pull request #67 from basti1508/master

Fix attribute name in apikey migration to fix "undefined method `api_key'" error.
Get rid of "joined/left" messages on Travis Build.

The default behaviour of the IRC notification is
pretty noisy, therefore get rid of "joined/left"
messages by the Bot joining before posting and
on leaving the channel.
Furthermore propagate only Failed builds and
transition from previous build state.