Bump up travis-core.

Includes fixes for build email and IRC notifications.
Bump travis-core.

Includes logging improvement for Campfire to figure out the
hostnames that fail resolving.
Update travis-core.

Includes fix to discard errors when email address syntax is illegal.
Bump travis-core.

Includes fix for more SMTP errors to be ignored.
Update travis-core to send build type in webhook
Update travis-core
Add note in README about issue tracker location
Use jruby 1.7.4
Bump travis-core and travis-support
Require states_cache explicitly, don't require load constants
Don't require states_cache, tasks do not use states cache addon
Merge pull request #1 from travis-ci/master

latest from upstream