Picard 1.124 isn't packaged correctly and does not run

The Picard.t test fails unless we ignore it.
Merge pull request #178 from brummett/picard-fix

Picard 1.124 isn't packaged correctly and does not run
Updated class browser cache.
Updated `genome` tab completion.
Updated `gmt` tab completion.
adding tumor purity correction option
adding tumor purity correction option
remove debugging output, reword doc lines