corset: update for samtools 1.1 and corset 1.04.

Updating the corset formula for the new versions of samtools and corset.
This should resolve the compilation bugs reported on
https://groups.google.com/forum/#!topic/corset-project/6KZgWR1uZlU
Yes, the @BrewTestBot handles changes to the bottle block. If it's deleted it will be re-added in a weird place.