Istio Release 0.1.6

Istio alpha release 0.1.5

Add greater leniency to mixer rate-limit test (istio#314)

* Add greater leniency to mixer rate-limit test

* Run gofmt

Istio alpha release 0.1.3

Istio alpha release 0.1.2

Istio Alpha release 0.1.1

Updating istio version (istio#225)