Merge branch 'master' of https://github.com/cbhaley/calibre
Edit metadata dialog: Add a keyboard shortcut to swap title and author [Alt+Down]. Fixes #1397701 [[Enhancement]](https://bugs.launchpad.net/calibre/+bug/1397701)
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Fix #1398198 [Edit Book: Strange backwards selection when you type XML entities](https://bugs.launchpad.net/calibre/+bug/1398198)
arstechnica: remove twitter/facebook links and 'you make also like'
Update Ars Technica

Merge branch 'master' of https://github.com/jelly/calibre
1) Change the wireless device driver to manage its own connections.
2) Add an API for devices to determine if some other device is connected.