Git vs package

Removes ARDMK_PATH, ARDMK_FILE and arduino-mk subdirectory

Looks for ard-reset-arduino in $PATH or ARDMK_DIR/bin

Fixed git-archive command in RPM SPEC file

Kept Common.mk - AUTO_ARDUINO_DIR still works

Upped version to 1.2.0

Removed some whitespace

Updated docs

Also removed arduino-mk dir from debian package's arduino-mk.install

Git users will need to remove the arduino-mk subdirectory from their makefile's include line