Adding bib file and adding references to vignettes

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@143 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Removing unused sample_vignette

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@144 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Adding comments and updating man file for CAPM hypothesis test

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@145 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update to DESCRIPTION

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@146 edb9625f-4e0d-4859-8d74-9fd3b1da38cb