* rcc: Use the right binary when invoking manually
Otherwise we could run into the following error:
rcc: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/rcc': No such file or directory
Makefile:626: recipe for target 'rcc/qrc_images.cpp' failed
make: *** [rcc/qrc_images.cpp] Error 1
* README: add automotive screenshot (fixes#32)