Develop (#34)

* Implemented Mediascan and Mediaoptimize skeleton.

* Refactored MediaRequest struct.

* Typedef MediaScanRequest and MediaOptimizeRequest.

* Change RequestPriority as a parameter of MediaScan and MediaOptimize insteadinf of a field of MediaScan or MediaOptimize Request.

* Changed the corresponding kinetic protocol version to 3.0.5.

* Report failed keys for mediascan operation. Report last processed key for scan and optimize operations.
Changed signatures to be more consistent with existing interfaces. Increased minor version to reflect interface update.

* Added max_results paramter to MediaScan call. Setting command priority automatically. Adding start_key_inclusive and end_key_inclusive parameters to MediaScan and MediaOptimize to correspond to GetKeyRange interface. Cleaned up code-style.

* Removed erroneous move statements.