Bump travis-core

- Make /builds return recent builds instead of nothing.
Update travis-core

- Only return started builds for Build.recent, sort by started_at date
Update dependencies
Update gemspec
Remove references to "result" in specs

This column has now been removed in favor of the state columns.
Remove hubble dependency
Update travis-core
Whitelist travis-lite for authentication
Merge branch 'master' into rkh-metrics

Conflicts:
	Gemfile.lock