Reordered headers to avoid crazy boost preprocessor errors.
Removed unneeded include.
Merging code from old OSL branch.
Reverted appleseed.python includes reorder.
Merge remote-tracking branch 'upstream/master' into OSL
Use OVERRIDE, instead of override.
Made OSL an optional dependency.
no longer link against libicu (International Components for Unicode) on linux.  the build instructions on the website have been updated such that linking against libicu is no longer required (boost and xerces-c are now built without icu support).
updated Mayaseed to version 0.3.2.
updated copyright notices.
fixed some copyright notices.
minor tweak to the log output in watch_folder.py.
watch_folder.py now correctly handles appleseed binaries paths containing spaces.
updated/tweaked more copyright notices.
renamed command line argument -f to -p in watch_folder.py.
added -f command line argument to watch_folder.py to allow setting the output format (e.g. png, exr).
added const qualifier.
Merge branch 'master' into OSL
replaced boost noncopyable by foundation's.
More OSL placeholder classes.