separated shaders into glsl120 and glsl150, added explicit gl version detection
bugfixes to glsl 150 shaders/scripts
Fixes a moc generation error with boost >= 1.48

See:

https://bugreports.qt-project.org/browse/QTBUG-22829
Possible fix for #591, needs to be tested on a mac
Merge pull request #592 from ros-visualization/fix-591

Possible fix for #591, needs to be tested on a mac
Merge pull request #588 from ros-visualization/gl_version_detection

Explicit detection of GLSL version
Merge pull request #589 from ros-visualization/fix_moc_boost

Fixes a moc generation error with boost >= 1.48