upgrade celery
no tasks within tasks
store message with failure
join on diff columns, closes #412
revert
silence warning
do not pass self
move create up, closes #437
add ignore result to tasks
use dataset.create
make class for importability, closes #407
add join on mulitple cols docs
fix merge tests
move server setup, testing, contr code, out of readme into docs, closes #429
count command, closes #432
var drop fix
attempt to recover from a failed save by halving batch size, closes #270
Merge pull request #439 from modilabs/join412

Join412