Improved documentation and minor fixes

removed examples compiled with outdated MySensors protocol and instead
included documentation how to add self-compiled sketches
use codebender to compile sketches

I had codebender username/password included originally but compiling
works without. Codebender usage guidelines allow "usage via API".
Added technical details for controller developers regarding OTA bootloader
Bugfixes and rewrite parts of code
Need to include MySensor.h for gateway examples to work in codebender.
Classify method.
Fix compiler error.
Include more debug text in MINIMAL definition, and enable MINIMAL as default, saves 432bytes