Main changes - changes by bperrybap:
- Use LCD_5x8DOTS as default.
- activate backlight in the begin routine.
- minor corrections to the various libraries.
- Fixed incorrect use of 5x10 for default font (now matches original LQ library)
- Fixed typo in SR2W mask define names changed default backlight state to on
- Added support for faster SR_2W mode
Closes #19 - Added support for on/off commands
Closes #18 - Set backlight initial state during initialization to off.
Closes #17 - New SR3W class.
Added documentation for new class
Move some methods for the public interface of the LCD class to private, since they should never be called by the user.