Use autoconf macros to search for opengl.
Whitespace
Shaders do not require executable bit.
Make "make distcheck" work again

If this command is run prior release it verifies that the source can
be built and installed. Which should avoid having broken tarball like
with 0.9.0 release.
Cleanup the ebuild.
Generate and install man page
Package icons and desktop file.
Fix variable name typo and copyright year.
Fix typo in desktop file to pass validation
Merge pull request #487 from scarabeusiv/master

Various autotools fixes