Merge pull request #14 from adgoudz/andrew

add reference option for all create and add commands
add Andrew as an author
update version and readme for new author
fix #15: unable to checkout or push release in repo cloned after a release
fix the rest of #15: Cannot push refspec any
commit a test for #16
fix #16: newly-cloned repository reports incorrect status
don't use a remote that we don't have...
fix reference_root code to work on perl 5.12