Merge branch 'add_tests_actor_transform'
Respect different layers in vtk message.
Support for multiple layers/renderers.
Merge remote-tracking branch 'origin/layer-support'
documentation updates
Removed bootstrap theme
Adding documentation for build and other sections
Added documentation on build and support
Added special config for jsdoc-sphinx bridge
Updated cmake to use jsdoc-sphinx config
Renamed vglModule to vgl for ease of use
Merge remote-tracking branch 'origin/readthedocs' into next