osdeps: clean-up section for eigen3

squeeze? not supported... ubuntu 10.04? lol... so ubuntu and debian use
the same name for a similar package -- make the osdeps the same.

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
osdeps: remove eigen2

I hope this is deprecated enough?

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
remove eigen3 build-from-source informations

use system-package

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
Merge pull request #20 from marvin2k/modernize_eigen

Modernize eigen