This adds an Application subclass to get the onCreate() method, which is
called once at the first start up of the app, before any Activity starts.
Tor is configured there to ensure it is setup before anything happens.
This also moves the "Use Tor" pref listener to a more appropriate place.
If the user has not changed the "Use Tor" preference, then the default
should be to use Tor if Orbot is installed. The user can still override it
by going an unchecking "Use Tor".
* renamed VideoInfoItem to VideoPreviewInfo
* moved streaming service-related classes into their own, new package services
* added javadoc to some classes and methods (where functionality is known well enough to explain)
* De-duplicated common fields between VideoInfo and VideoPreviewInfo by moving them into a common superclass: AbstractVideoInfo
* Removed 2 methods which only call super(), and therefore are unnecessary: PlayVideoActivity.onResume() and PlayVideoActivity.onPostCreate(Bundle)
* still need to use the start position value stored in the PlayVideoActivity's Intent bundle, to set the VideoView using seekTo()
* need to test timestamp extraction regex, and possibly move it somewhere else
*need to find a better way to get the startPosition value to ActionBarHandler, which I thought used VideoInfo objects, but apparently doesn't
* currently there is a small setStartPosition() method
* moved on to version 0.6.0
* fixed youtube url sicnature encryption (vevo videos can be watched again)
* removed play action from the ActionBar
* rolled back changes for hiding the InfoBar inside PlayVideoActivity
* some small layout changes
* removed some files to be ignored (mostly inside .idea directory)
* etc
