Merge pull request #293 from teharrison/master

fix empty nodeattr check
Merge pull request #294 from teharrison/master

fix pointer derefence
Fixing nil dereference.
Merge pull request #295 from jaredbischof/master

Fixing nil dereference.
Added mongo indexes for commonly queried fields.
Removed limit from deleting zombie jobs and recovering jobs functions.
Merge pull request #296 from jaredbischof/master

Added mongo indexes and removed limits from recovering jobs.
Adding error handling when workunits in queue point to nil object or workunit info is nil
Version update.
Merge pull request #297 from jaredbischof/master

Nil pointer bug error handling and version update.
Checking return statements to fix multiple http responses to single request.
Version update
Merge pull request #298 from jaredbischof/master

Fixing multiple responses to single http requests.
add job date range query, fix multi-value queries
Merge branch 'master' of https://github.com/MG-RAST/AWE