Turned a message into a verbosite level depending message for trying to solve a problem with unity testing abrem using package testthat.
Also, added "Imports Rcpp (>=0.11.1) for trying to solve a problemp with r-forge checks for the linux platform

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/abernethy@81 edb9625f-4e0d-4859-8d74-9fd3b1da38cb