Project explorer filter is cleared when entity is picked. https://github.com/appleseedhq/appleseed/issues/313
allow negative sample and pixel values.
added world space position diagnostic mode.
Merge pull request #422 from liiza/project_explorer

Project explorer filter is cleared when entity is picked.
minor code tweaks.
minor code tweaks.
Added assertions to the 2nd and 3rd coefficients.
Merge branch 'master' into OSL_objectspace
Split computation of accumulated transforms for assemble instances.
Merge branch 'master' of https://github.com/appleseedhq/appleseed into oren_nayar

Conflicts:
	src/appleseed/renderer/modeling/bsdf/orennayarbrdf.cpp
Merge pull request #421 from luisbarrancos/oren_nayar

Oren-Nayar fixes and cleanups
Object space transforms working. Updated OSL scenes with refs.
CTRL+E will close the Entity Editor and save the changes.
Merge pull request #423 from liiza/project_explorer

CTRL+E will close the Entity Editor and save the changes.
changed keyboard shortcut to validate changes & close entity editor window.

it's now Ctrl+Enter instead of Ctrl+E.
- Add a pixel inspector tool under the mouse with a button to toggle on/off that provide NDC, RGBA and pixel position information.
update resources files for new icon for pixel inspector
update position in the file so th icons are together
Update the icons look, kept the names the same.
Merge pull request #415 from est77/OSL_objectspace

Store the accumulated transform sequence from worldspace in assembly instances.