Want to ignore Xcode build folder.
Forgot trailing newline in .gitignore.
Re-added pbrtparse.hpp, which was missing for some reason.
Registered new anisoward material in api.cpp.
Update Xcode project to correctly locate volumes folder.
Modified XCode project to build with OpenEXR installed at /opt/local.
Merge branch 'openexr'
Comment out the missing perspectiveDiffraction camera from api.cpp, following openexr merge into master.