Adds Pester 1.1b15

From the webpage: Pester is designed to let you set, dismiss or snooze
an alarm or timer as quickly and painlessly as possible, entirely from
the keyboard if you wish... Use Pester to remind you to catch the bus or
attend an upcoming meeting.

I'm not in any rush to merge this or anything, but if somebody else finds it 
useful, it may be worth merging in.