Added .Rbuildignore file to not include sandbox and .svn


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3324 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added zoo to Depends


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/returnanalytics@3325 edb9625f-4e0d-4859-8d74-9fd3b1da38cb