Android-SDK - 1.6.1 Release

## 1.6.1
April 25, 2018

- Release 1.6.1

This is a patch release for 1.6.0 and 1.5.1 Optimizely SDKs.

### Bug Fixes
* Fix for the following issue:
Our github issue is [here](
The JobWorkService was probably destroyed but we didn't cancel the
processor. It causes an exception in dequeueWork in our JobWorkService.
We wrapped the dequeueWork with a try/catch and are also now cancelling the background task in onDestroy.

* Fix for possible error when loading logger via dagger (fall back logger provided).