Added json files for cornell box.
Added libpng and zlib to repo. New class for video output.
ArnoldFileFrameManager updated. INSTALL fixed.

ArnoldFileFrameManager could dump frames in given fps with duplicate
frames. CMake file has been modified to install needed headers and
libs for GUI (new: libpng and zlib).
Fixed Orientation Lerp, FileFrameManager dump(). New demo.
Added "predictive" option for predictive rendering.

Using method of sharp RGB without white balance from:
Picture Perfect RGB Rendering Using Spectral Prefiltering and Sharp Color
Primaries.
Known Problem: Lights turn to look red.
Added model for Jules (still working on it).

Now we have a box based on Jules's layout.
Added comments. Added two ies files for cornell2.
Refined scene for Jules. Fixed bug for sharp RGB.
No clamping on Orientation lerp
Readme updates and build settings updates

If building arnold, must install libpng and zlib before compiling.
Didn't want to merge dependencies for those libraries, so it's a
separate one-time step.
fix setVal in orientation