DisneyLayeredBRDF work.
Merge branch 'master' into est_disney_material
Modify expression set in dinsey editor inputs

The color which should be found in the input of the disney material
editor must be transformed from sRGB to linear RGB.

Also the texture expression should be different. It should look like
texture("path", ...).

Signed-off-by: Marius Avram <marius.avram1309@gmail.com>
more work.
many small fixes and cleanups around the new curves feature.
Merge branch 'master' of github.com:appleseedhq/appleseed

Conflicts:
	src/appleseed/renderer/modeling/object/curveobject.cpp
added/removed includes and forward declarations.
Merge remote-tracking branch 'upstream/master'
many cleanups around the new curves feature.
Merge remote-tracking branch 'upstream/master'
more cleanups around the new curves feature.
more cleanups around the new curves feature.
apply object instance transform to curves, plus some refactorings.
added built-in hairball curves object.

sample usage:

    <object name="curves" model="curve_object">
        <parameter name="filename" value="builtin:hairball" />
        <parameter name="curves" value="300" />
        <parameter name="width" value="0.001" />
    </object>
removed trailing whitespaces.
removed trailing whitespaces.
removed trailing whitespaces.
removed trailing whitespaces.
removed trailing whitespaces.
removed trailing whitespaces.