Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Added Oren-Nayar BxDF, closure.

        - Added Oren-Nayar BRDF, OSL closure.
Updated cmakefiles, OrenNayar.
Added OrenNayar test scenes.
Added OSL OrenNayar shaders.
Added Oren-Nayar OSL shaders.
Added Oren-Nayar OSL test case.
Registering Oren-Nayar to OSL.
Registering Oren-Nayar to OSL, fix typo.
Merge remote-tracking branch 'upstream/master'
Merge pull request #350 from camargo/master

Fixed appleseed.studio preserves the state of the user interface across runs
small code tweaks.
Merge remote-tracking branch 'upstream/master'
Support drag and drop of project files to the main window
Fixed settings for the osl closures test scene.
Made inputevaluator array bigger. Made DataSize public, so it can be asserted.
Assert that CompositeClosure fits into InputEvaluator's data size.
add "text/plain" and "text/uri-list" support for the mimeData type of the drag and drop to prevent so problem on Mac and Windows platform.
Merge pull request #354 from est77/master

Fix gcc crashes in OSL