Better scrubbing of numeric tags (tracknumber, etc.).
When a release is found, print its release URL.

Helpful for re-trying transcodes or reporting torrents with issues.
Inform user of possible trumps due to releases with bad required tags.
Remove support for downmixing.

The rules for downmixes are complicated. To know when they are
allowed, as far as I can tell, requires some knowledge of which
streams are present on the source media, which, of course, whatbetter
does not have.
Bump version to 1.1, add PEP-compliant __version__.
Allow the user to skip 24-bit edits.
Improved dithering.

Follow the What.CD wiki recommendations for dithering with sox (use
VHQ resampler and explicit 'dither' post-process step). When dithering
to MP3 transcode, skip flac command and use sox directly.
Add -h flag to lame 320 CBR encodes.

Matches the default quality setting of VBR encodes.
Improved upload description.

Now includes a permalink to the original torrent (for proper
sourcing/reporting), an example of the command that was used to
transcode the release (including the dithering process, if any), and
the whatbetter version number.

(Fixes #40.)