Adding preview images
Merge branch 'preview-img' into transparency
Moving material processing to the beginning of the queue since it can cause a deferral request due to transparency.
Connecting the opacity uniform for the phong shader.
Removing debug statements.
Improvements to blue falcon model.
pushing transparent objects to the end of the render queue.
move the deferred draw commands to their own function for reuse.
Moving transparent objects to their own pass.
first pass at integration of transparency with deferred rendering.
Finishing up transparence on the deferred strategy.
Fixing bugs found by the closure compiler.
Fixing obj id pass.
Fixing tone mapping issues caused by alpha channel changes.
Merge pull request #65 from arturo-mayorga/transparency

Transparency
Merge remote-tracking branch 'upstream/dev' into dev