Changed accelerometry dependence to 2.2 rather than 2.2.2 to see if it can grab that version from the latest CRAN stable release. 

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@60 edb9625f-4e0d-4859-8d74-9fd3b1da38cb