added ilmbase 2.2.0.

download: http://download.savannah.nongnu.org/releases/openexr/ilmbase-2.2.0.tar.gz
updated openexr to version 2.2.0.

download: http://download.savannah.nongnu.org/releases/openexr/openexr-2.2.0.tar.gz
added oiio 1.4.

download: https://github.com/OpenImageIO/oiio/archive/RB-1.4.zip
added osl master.

repository: https://github.com/imageworks/OpenShadingLanguage
commit hash: 77a08420521c0bc74480651787c16040ea3430f8