Added library path.
Finished making gl.h GL ES friendly.
Finished making gldraw.h GL ES friendly.
Start making plotter GL ES friendly.
Add HelloPangolin minimal example.
Fix small gldraw bugs.
Fix glDrawCircle.
glsl improve singleton instance.
Cut out plotter. To be rewritten.
Add preliminary support for pangolin widgets with GL ES. Need to add text rendering.
Add missing file, datalog.cpp