Several improvements - not fully tested

- The bootloader works reliably with uart_debug is turned on but it
happened to me twice that it didn't respond at all if uart_debug is
off... probably a timing issue - to be further looked at - for now I
enabled uart_debug as default
- Several improvements to the NodeJsController:
- reloading hex files into database only if changed
- storing dates as dates in mongo rather than integers
- sending time in seconds, not milliseconds!!!
- CapacitiveSensor standard Arduino library added
- Developed basic EventScheduler library to schedule events at specific
times of the day
- Added NightLight example with:
- solid state relais to switch light on/off
- capacitive sensor (button)
- at this point turns light on at 8 PM and off at 8 AM
- in future events should be configurable and stored in eprom
- used TimeAwareSensor but changed to Time.h Sync mechanism