install_dependencies.sh bug

Hi,
I just went through oF installation for the first time and found what I think is a bug in install_dependencies.sh.
There are two calls to apt-get in the script but the return value is checked only after the second one.

In my case, the first apt-get call ended with an error (unmet dependencies on portaudio19-dev) which I didn’t notice. But the script continued, the second apt-get call was successful, the compileOF.sh part threw a lot of errors which I was able to resolve by manually installing missing libraries (a bit painful process). I ended up with compiled projectGeneratorSimple which was broken in exactly the same way as here: http://forum.openframeworks.cc/t/troubles-with-project-generator/12109/0
So I reviewed my process and found that one failed apt-get…

tl;dr - I believe there should be an exit value check after the first apt-get in scripts/linux/ubuntu/install_dependencies.sh