fix(comments): add an activity when there is a new comment

so we will save as part of activity who should get notified about it.
and push an activity notification for those users so they can update
their activity list.

SD-684 SD-656
temporary change to allow testing of reset password
Merge pull request #252 from amagdas/temp-test-pass

temporary change to allow testing of reset password
Merge pull request #251 from petrjasek/master

fix(comments): add an activity when there is a new comment
fix(celery): use custom serializer for celery

we use mongo serializer that can take care of ObjectIds and datetimes
Merge remote-tracking branch 'petr/fix-celery-serializer'
fix(io): fix update ingest cmd

it was using superdesk.providers instead of superdesk.io.providers
SD-248 : Handle data uris on server (fix for webcam)
Merge pull request #255 from ioanpocol/master

SD-248 : Handle data uris on server (fix for webcam)