AlienWii32 fix FEATURE_FAILSAFE
Merge pull request #264 from MJ666/AlienWii32_fix

AlienWii32 fix FEATURE_FAILSAFE
Improve SBus code.  Fix SBus Failsafe detection, tested with FrSky X8R
and X4RSB.  Check for end-byte to improve robustness.

Less logic.  Better definition of frame structure eliminates the '-1's.
LedStrip failsafe warning now correctly checks that the feature is
enabled.
Update failsafe documentation.
Update README.md

I think we need a link to the Cleanflight releases in the Read Me.
Merge pull request #269 from Akfreak/patch-3

Update README.md