Pose Sequence Tweaks

- Pose sequence only refers to an IMyoEventGenerator since that's all it really cares about. The event that it publishes uses the IMyo reference from the IMyoEventGenerator that it's listening to.
- The pose sequence event arguments will now have all of the poses for that event.
- Updated the readme.
Held Poses

- Added an implementation for holding poses.
- Updated the readme.
Doc Comments: Communication Namespace

- Added doc comments for non-private members to the following files:
-- Channel.cs
-- IChannel.cs
-- IChannelListener.cs
-- RouteMyoEventArgs.cs
Doc Comments: Discovery Namespace

- Added doc comments for non-private members to the following files:
-- DeviceListener.cs
-- IDeviceListener.cs
-- PairedEventArgs.cs