Updated example

Visual feedback on button presses
Merge remote-tracking branch 'upstream/master'

his merge is necessary,
Merge remote-tracking branch 'upstream/master'
added AVFoundation links for non local OpenCV to CMakeLists.txt
Change build-osx-snapshot to build against x86_64 only
Make only for x86_64 architecture
Added debug info to DFU util
Added utility to get firmware version
Merge pull request #96 from SableRaf/master

Various fixes