fixed bug in job_delete
Merge pull request #213 from teharrison/master

hotfix for job_delete
fixed bug in workbench display table
Merge pull request #214 from teharrison/master

fixed bug in workbench display table 
Merge branch 'master' of github.com:MG-RAST/MG-RAST into develop
Moved "unpack" operations on upload page to be an operation that is performed on cluster nodes so that users can spawn many "unpack" operations and not be concerned with the operations dying from overwhelming the web hosting machine.  Also, allowing users to delete files that are undergoing an operation if and only if that operation is "uploading".  This allows users to delete files from incomplete uploads.