less markdown in readme; updated sample session

removed obsolete 'poster' param

minor fixups

added xdg-open/open logic to URL opening

give the echo command a -e option so it behaves as expected in Linux and BSD; closes #1

moved getopts credit comment

README.md edited online with Bitbucket

changed to xdg-open, added URL output

README.md edited online with Bitbucket

README.md edited online with Bitbucket

added dpaste.sh, simple CLI client