(#2610) - Make CI build faster
(#2605) - small edits to the release notes
(#2601) - add delay for pouchdb-server tests
(#2610) - Follow up to increase depths

Travis needs to have the last X commits in order to checkout, so depth
shouldnt be lower than what we expect the maximum queue of changes
to be tested
(#2592) - pass back node http errors
(#2611) - possible race condition and clean up in level destroy
(#2608) - race condition in sync replication test