Add documentation about building Thrive in Linux about thrive HOT 5 CLOSED

A potential problem already discovered: Building Ogre in release mode and Thrive in debug mode will lead to errors about missing Ogre libraries because they are expected to have the "_d" suffix. So Ogre should be compiled in debug mode (or both release and debug).

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Currently working on it, see https://docs.google.com/document/d/1FGMzODYC8fRpW9uTvpN7YJ8vPJitA3GBuo998efgxJk/edit?pli=1#
and http://pastebin.com/2e3xAmev for current progress. Build script works on Ubuntu Trusty, next steps are to clean/improve/harden the script, and get it on Travis

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One thing to remember is that not all linux distros use apt-get install. I'm on Arch so it's pacman -S instead.

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Oh, for sure. The current script doesn't even work on previous Ubuntu versions, it would be extremely conceited to think it works out of the box on another distro entirely. We have, however, managed to condense the workarounds necessary for CEGUI quite a bit, so hopefully that'll help with platform switches.

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I have written a basic one and @billythakidd04 said that he would amend it with Ubuntu specific extra stuff. So this is done

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