(#1001) - Failed replications calls complete callbacks correctly
(#1564) - Fix check for travis secure vars
(#1853) - make perf tests more accurate for skip/limit

This was accidentally reverted by
fd2a695f4d5ca98dcc8d4f66a2eeabcd437939a6.
(#44) - Add localstorage-down option to LevelAlt
(#1903) - include .version in build
(#1768) - changes as event emitter and in it's own module
(#1653) - server sent events for replication