RELEASE: re-enable scrobbling; optional auto-playback & station sorting

* v2.2.0

* uses Pandora JSON API (modified code from the Pithos Project)

* NEW: adds optional automatic playback of previous station
* NEW: adds option to sort stations
* UPDATE: re-enable scrobbling via a HACK (see BELOW)
* UPKEEP: update to most recent pithos library code; remove old code
* BUGFIX: remote STOP now stops play

* BUG: scrobbling broken by core (but now works via HACK; core addon fix pending)

NOTE: see http://forum.xbmc.org/showthread.php?tid=70471
NOTE: Pithos project home @ https://github.com/kevinmehall/pithos

The current scrobbling function within XBMC requires that the duration
of the audio stream be set prior to calling the player for successful
scrobbling (even when the duration is correctly calculated by the player).
The current script HACK sets a fictional duration, which works, but can cause
some minor UI and scrobbling issues.

I've submitted a patch to the XBMC team to fix this in the core addons,
which will, in the future, negate the need for this HACK. The patch will
be applied to the addons, but probably not the core. So, use the addons
("Last.FM" and "Libre.FM Scrobbler") for your scrobbling; and disable the
core scrobbling function (Settings / Music / Song Submission).

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Merge branch 'blead'