Added some new features:
* Rip a list of URLs from a file from the command line with the -f flag.
* Remember window position.
* New update mechanism (see notes below).
For future updates, RipMe will check against the ripme.json file from
the master branch on GitHub rather than depending on the version of the
file hosted on rarchives.com. Also, updates to RipMe will be downloaded
directly from the releases on GitHub. This keeps development and
deployment all in one place on GitHub and reduces maintenance and
coordination costs.
