Adjust for R 3.1.0 changes.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/colorspace@114 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Avoid search path semantics.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/colorspace@115 edb9625f-4e0d-4859-8d74-9fd3b1da38cb