Merge pull request #1 from ducas/master

Add Description and Comments to TFS Bugs
Include iteration path on new bugs in TFS
Include QC Assignee, Detected By and Detected On in System Info field on TFS bug
Ensure Iteration Path only mapped if Detected in Release specified.
Include Area Path on new defects if specified
make prefix available globally and include it in TFS query
output error messages from tfs publish