Make package information more obvious in Software Center

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Search for "Music Store" in Software Center. The RB plugin for the music
store is not all that obvious: it is third in the list, it is named
"Ubuntu One Music Store Rhythmbox plugin" (people don't care that it's
for Rhythmbox, nor do they care that it's a plugin), and the description
is minimal ("A Rhythmbox plugin that makes the Ubuntu One Music Store
available in Rhythmbox."). Rewrite to make this more obvious (and
perhaps get it to the top of the list? shades of SEO manipulation of
websites...)

The "website" link for the plugin should not be the launchpad page;
instead it should be https://one.ubuntu.com/music (once the marketing
material exists there).

There should be a screenshot.

The description needs writing first and then adding to the package.

 affects ubuntu/rhythmbox-ubuntuone-music-store
 assignee mattgriffin
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