Added the AB2 logo emp files

These include the original logos prior to library import. Using the
scale.pl perl script obtained from the link below, I converted the
original file into the other two files using the commands also listed
below. The script automatically mirrors an image if the output layer
specified is a bottom layer.

git://github.com/madworm/KiCad-Logos.git

./scale.pl ab2_logo.emp ab2_logo_350_mils.emp 21 0.35in
./scale.pl ab2_logo.emp ab2_logo_reverse_350_mils.emp 20 0.35in