Merge branch 'release/v0.6.0' into develop
InfluxDB v0.8 returns 400 when querying nonexistent series
travis: Drop support for old version and add v0.8.x
Fix non-exhaustive pattern match
travis: Allow failures on influxdb < 0.8
travis: Format only
test: Clean up cluster admin at the end
Add shard space API
Add configureDatabase
Delete comments about scheduled deletes

InfluxDB now has retention policies instead.
test: Fix compiler warning
Merge branch 'feature/influxdb-0.8' into develop
Remove ScheduledDelete type
Add Typeable and Generic instances
Fix build failure due to missing dependency on ghc-prim
Bump up to v0.7.0
Merge branch 'release/v0.7.0'