Navbar now displays "Feedbunch" instead of "Feedbunch (BETA)"

I suspect it took too much space in small-screen smartphones.
WIP: scheduled job to destroy old job states from the database.

It is assumed that after a certain time (configurable in application.rb, 24 hours by default) the user will no longer be interested in the job state alerts in the start page; so, old job states are removed from the database, which will in turn make alerts disappear from the start page.
Added unit tests for DestroyOldJobStatesJob.

This job will remove job states older than 24 hours.
Removed job_schedule.yml file. The static resque schedule is in the static_schedule.yml file since quite some time ago.
Added static schedule to run DeleteOldJobStates every hour.