Skip requests that are not pickmed when processed

Due to processing delays, by the time some pickmes are processed they can have
been depickmed, merged into the deploy branch or otherwise no longer in the
pickme state.

To avoid extra work, only process pickmes that are pickmes at the time of the
checks.
Merge pull request #101 from rschlaikjer/only-test-pickmes

Skip requests that are not pickmed when processed

During the delay between pickme and actual pickme processing, pickme's can no longer be valid.