Fix issue #2 and #3 (missing dependencies and rotary encoder reversed)

Fixed issue #2 by updating the automake/autoconf configuration to correctly include the glcd-usbbat driver.
This way, LCDproc can be compiled as usual, without messing with the makefile.

Fixed issue #3 by reversing the rotary encoder return value.

Also corrected some trailing whitespace errors (my editor strips these when saving).