[Player] Add OpenNextUri() method

Based on original work from Sébastien Bianti <sebastien.bianti@linux.intel.com>

- Resolves bug #35
- Documentation updated.

Signed-off-by: Regis Merlino <regis.merlino@intel.com>
[Server] Update following the publish_object() connector API change

Signed-off-by: Regis Merlino <regis.merlino@intel.com>