added LcdDetected() (thanks Scott Rubin)
Update LiquidTWI2.cpp

1. Add support for using TinyWireM on ATTiny devices
2. Prevent hangs in write/print when the device is not detected.
3. Add support for common anode rather than common cathode displays (invert the backlight pins).
delete junk
fix compile error on ardino 1.00
Merge pull request #4 from nsayer/patch-1

Update LiquidTWI2.cpp
merge nsayer alternate method for DETECT_DEVICE
fix compile error from nsayer merge
added credit to nsayer