Feature/brian memory settings for unaligned

This should give an option that allows you to control the memory used by the unmapped read steps.  The param is called unmappedReadsJobMemM and defaults to 8G.  I've run the workflow on my local VM.  I also updated Adam's decider to include this param (but not my earlier decider).  Sergei will need to verify, release to a release/2.6.1 branch, package to a zip, and upload to S3 for sharing with the Tokyo group.  Denis can answer questions in this process, he's very familiar with hubflow and packaging workflows.