[API Break] Double Tap Pose

- Removed the ThumbToPinky pose for SDK 0.7.0 support. If you are using this Pose enum value in your code, it will no longer compile.
- Added the double tap pose from SDK 0.7.0.
Fix GetEventRssi()

- This was setup incorrectly because I don't think anything really uses it right now. It's been modified to call the correct PInvokes.
Duplicate Dispose() Code

- Removed a duplicate check inside of the Dispose() call in Myo.cs.
[Fix] Add Lock/Unlock Support

- Fixes #2 (https://github.com/tayfuzun/MyoSharp/issues/2).
-- Added support for being notified when the Myo locks or unlocks.
-- Added the ability to call lock or unlock on the Myo.
BasicSetupExample: Inform User of Locking

- Updated the BasicSetupExample program to show users how to listen to lock/unlock events.