fix outdated preview image on activity feed
lock on externalId when creating new users
add test for account creation locking
simplify logic flow, fix error message
add revision back to the content body modified event
add unit test
Merge pull request #621 from stuartf/activityPreviews

Activity shows old preview in activity stream after new revision has been uploaded
allow express to accept POSTs up to the limit we set in nginx
move max upload size setting to config.js
check the output of both user creations when testing for race condition
Added jsdoc and assertion for double failure to account creation locking unit test
Merge branch 'accountCreationLocking'

* accountCreationLocking:
  Added jsdoc and assertion for double failure to account creation locking unit test
  check the output of both user creations when testing for race condition
  simplify logic flow, fix error message
  add test for account creation locking
  lock on externalId when creating new users
simplify the fix to just adding config
Sending string on reCaptcha error.
Merge pull request #666 from Coenego/duplicateuser

Fix for multiple accounts
Merge pull request #665 from stuartf/maxUploadSize

allow express to accept POSTs up to the limit we set in nginx