add positive energy error to signals
modify signal so it is there even for unsuccessful tasks
cleanup prev
add positive energy error handler to MPWorks
remove LiO2 (deleted) from test set
update MPVaspDrone for new pmg drone
default to update_duplicates=T in VaspToDBTask
use PMGJSONEncoder so numpy arrays are properly encoded
manual gzip output
remove print statements
reduce walltime to 1 hour for db insertions
turn off duplicate overwrite
replaced PMGJSONEncoder/Decoder with MontyEncoder/Decoder
Merge pull request #8 from matk86/master

replaced PMGJSONEncoder/Decoder with MontyEncoder/Decoder
FireWork->Firework. Req FW v0.91 or greater
clean up reconstitute dates
to_dict -> as_dict()
update dependency versions
udpate reqs
more update deps