Converted from optparse to argparse. Changes the interface to require '-' when using piped input via stdin.
Minor fix in the README
Non-interactive display of found URLs with -n
Removes the need of the dash (-) to read from stdin.
Adds documentation about the option --no-browser.

And removes the mention about the dash in the README
Merge pull request #16 from xakz/Updates-README

Minor fix in the README