Make it possible to run ./test.sh from bin folder

[sashao]

If someone like me goes to bin folder and runs "./test.sh ../assets/test/scientists.jpg", file_not_found error will occur.
Fixed RUSTFACE_HOME detection when script runs from other places.

[jjhbw]

Thanks for bringing this to my attention. I personally never use this script, because it doesn't really add anything IMO.

Whenever i'm checking out a piece of software, I never run scripts like this without reading them first (as IMO everyone should), which kind of negates the potential convenience it offers.

Isn't it way easier to just put the below command in the README, and remove this test script?

cargo run --release --example image_demo model/seeta_fd_frontal_v1.0.bin assets/test/scientists.jpg

This would be far more transparent.

[jjhbw]

I decided to remove test.sh, as it isn't really needed and unnecessarily confusing (93c97ed). Thanks for bringing this to my attention!