Merge pull request #526 from est77/master

Small disney material improvements and fixes #2.
Install SeExpr script examples

Signed-off-by: Marius Avram <marius.avram1309@gmail.com>
Fix crash on folding renamed layer

Signed-off-by: Marius Avram <marius.avram1309@gmail.com>
Merge pull request #527 from est77/master

More small fixes. Added test Disney BRDF scene.
Merge pull request #529 from marius-avram/install_seexpr_scripts

Install SeExpr script examples
Merge pull request #528 from marius-avram/renamed_folding_crash

Fix crash on folding renamed layer
cosmetic change.
Fixed small issue with side walls.
Fixed PR comments.
Fixed comment.
Merge pull request #531 from est77/est

Fixed last PR comments.
code cleanups.
reserve memory for the CDFs.
Merge branch 'master' of github.com:appleseedhq/appleseed
Use new OSL getattribute calls to instrospect shadergroups.
Fixed PR comments
Merge pull request #532 from est77/OSL

Use new OSL getattribute calls to instrospect shadergroups.