[Property] Add Mute Property

- Add R/W Mute property support, Mute states are received via
  the LastChange event, Mute value is set with a SetMute action.
- Documentation updated.
- Tested with Rygel and XBMC.
- Fix issue: https://github.com/01org/dleyna-renderer/issues/29

Signed-off-by: Christophe Guiraud <christophe.guiraud@intel.com>
[Device] Add OpenUriEx player method

- Add a new player interface method OpenUriEx, which is the same as
the existing OpenUri one, with an additional metadata parameter to pass
the URI description information in DIDL-Lite XML format.
- Documentation updated.
- Renderer Console python test application updated.
- Fix issue: https://github.com/01org/dleyna-renderer/issues/25

Signed-off-by: Christophe Guiraud <christophe.guiraud@intel.com>
[Documentation] Fixed some bugs in the docuemntation

- Readme file incorrectly referred to dleyna-server
- Replaced the term server objects with renderer objects in API.txt
- Tidied up some of the property defitions in API.txt

Signed-off-by: Mark Ryan <mark.d.ryan@intel.com>
[Copyright] Fix copyright headers

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Doc] add with-ua-prefix doc to README

- Add missing with-ua-prefix option doc to the README.
- Fix issue https://github.com/01org/dleyna-renderer/issues/41

Signed-off-by: Christophe Guiraud <christophe.guiraud@intel.com>