Merge pull request #38 from denniszhuo/master

Updated AVDECC Controller lib and command line application
controller:lib: Updated implementation for GET_RX_STATE, GET_TX_STATE, and
GET_TX_CONNECTION commands. Added functions that return the
ACMP connection states.
controller:app: Added ACMP commands to command line help.
controller:lib: Removed unused get_offset functions from public interface.
Updated functions to read ACMP Talker and Listener connection states.
controller:lib: Added more detailed documentations to AEM command
functions. Fixed error in converting MAC address to string function.
Fixed error to return the correct formatted address.
controller:app: Updated command line view descriptor function to print out
fields with the correct types.
controller:lib: Updated AEM Controller State Machine to use the inflight
class. Updated comments and formats.