fix httpOut path to match docs

Merge pull request influxdata#159 from influxdata/nc-udf-fixes

udf fixes

CHANGELOG updates for v0.10.0

mark 0.2.4 as released

mark 0.2.3 as released

Merge pull request influxdata#95 from influxdb/nc-fix-race-enabling

fix race enabling tasks on startup

Merge pull request influxdata#83 from influxdb/usage-client

Change 'enterprise-client' to 'usage-client'

Merge branch 'master' of github.com:influxdb/kapacitor

add type info to open service error

fix README typo