Remove executable bit.
Use properly sized attributes instead of all vec4s.
Remove Line and Square.
VertexArray should not be in glshader.hh.
Object3d::drawVBO is misleading function name.
VBOs are good.

* VertexArray can now optionally use VBO
  --> No more uploading static VA data to GPU each draw call
* Object3d takes advantage of this
Member functions start with lower case in our coding style.
PS2 guitar mapping courtesy of @karamel59. Closes #62.
Added GUITAR_COOP and GUITAR_RHYTHM song files. Closes #65.
More regex for Harmonix Rock Band Guitar XBox 360
Merge branch 'master' into webserver