New INSTALL_LINUX with distribution specific instructions, using the new resource file and pulls code from github.

Hi,
After some finishing touches the new instructions should be ready for use.

Compared to the old instructions it reduces the number of steps needed for installation. And because it pulls the code from github it therefore requires no searching for source packages by the user.

It holds working instructions for three distributions popular by developers, Ubuntu, Debian and Fedora. I have confirmed that it builds on Ubuntu 12.04, 13.04 and Fedora 17.

And best of all  it results in a compiled game that runs.
Cheers!