Add ofxOMXPlayer download before travis rpi compile

scripts/ci/rpi/pisetup.sh

@@ -6,8 +6,13 @@ pwd
 
 cd /home/pi/openFrameworks/addons
 git clone --depth=1 https://github.com/jeffcrouse/ofxJSON.git
+git clone --depth=1 https://github.com/jvcleave/ofxOMXPlayer.git
+
+cd ofxOMXPlayer
+git checkout 0.9.0-compatible
+cd ..
 
 cd ofxPiMapper/example_basic
-make
+make -j$(nproc)
 
 echo "Done!"