* 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
