Merge branch 'release/v0.3.0.1' into develop
Fix John's credit
Add missing date in changelog
Add GHC 7.8.3 to the build matrix
Replication factor has been removed from HTTP API

See https://github.com/influxdb/influxdb/issues/489 for details.
Remove useless comment
Enable parallel build
Bump up to v0.4.0
Merge branch 'release/v0.4.0'