Adds latest Android Wikitude SDK 3.1 library and adds MediaPlayer Activity
Introduces new Samples and Plugin implementation (Location fetching in native, …)
Introduces advanced samples
Kicks samples -> they are now part of a separate git
Forwards documentation to Wikitude website -> dev settings / phonegap plugin
Removes PhoneGap sample from Plugman repo and updates Plugin to support SDK version 3.2;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>
Resolves merging issues between Android and iOS;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>