Update README.md
Merge remote-tracking branch 'origin/master' into development
Merge remote-tracking branch 'origin/development' into development
Implemented Decoupler:

1. Removed push to front of queue ability.

Add:

2. Exposed task control methods for open loop implementation.
3. Implemented close loop operation with graceful stop.
4. Implemented onFail callback.
5. Implemented onDrop callback when channel is full.
6. Added sensible defaults.

Tested.