Travis
Fix RSSI range
Merge pull request #19 from nfi/travis

Travis CI
Fixed the 'throw' command to throw the exception in the emulation thread
Only log when DEBUG log level is enabled
Obay RSSI-Register when setting the CCA
Merge pull request #18 from cmorty/FIX_CCA

Fix the handling of the CCA
Merge pull request #20 from nfi/timer-log

Only log when debug log level is enabled
Merge pull request #21 from nfi/debug-throw

Fixed the 'throw' command to throw the exception in the emulation thread. Added warning in the 'stop' command if the CPU is not running.