Reassign copyright; Google relinquishes ownership.

Google has agreed to release any copyright rights it may have
to Open Pixel Control.
Add -lm and place linked libraries after object on gcc cmdline.
Merge pull request #15 from ferrouswheel/master

Add -lm and place linked libraries after object on gcc cmdline.
Merge branch 'master' of https://github.com/zestyping/openpixelcontrol
loading triangle mesh from space-delimited vertex text file
loading and rendering STL files
minor fixes