add more supported image types
(MqCluster) Replicate queues to all cluster members. Better startup/shutdown graceful handling in server.js
(TravisCI) Adding workaround for Cassandra ipv6, fixing test race
condition
Increased timeout when starting tests because of intermittent failures
Fix typo, remove unneeded parameter
Merge branch 'master' into mq-cluster
specify deps for preview-processor and activity
stub READMEs for oae-modules
Merge pull request #475 from stuartf/npm-fixes

Npm fixes
Merge pull request #468 from mrvisser/mq-cluster

(MqCluster) Replicate queues to all cluster members. Better startup/shutdown graceful handling in server.js
Merge branch 'master' into etherpad2

* master:
  stub READMEs for oae-modules
  specify deps for preview-processor and activity
  Fix typo, remove unneeded parameter
  Increased timeout when starting tests because of intermittent failures
  (TravisCI) Adding workaround for Cassandra ipv6, fixing test race condition
  (MqCluster) Replicate queues to all cluster members. Better startup/shutdown graceful handling in server.js
  add more supported image types
Etherpad followup

 * Creating pad/Storing file before creating a content item in Cassandra.
 * Split out etherpads configuration in internal and external hosts
 * Renamed revision.link to revision.downloadLink
 * Cleaned up various comments and jsdoc.