[BrowseObject]: Support Of ChildCount property

Fix issue #122: <https://github.com/01org/dleyna-server/issues/122>

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Error] Get better error message for BrowseObjects

Fix #123: <https://github.com/01org/dleyna-server/issues/123>

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Network Filtering] New API and save

- Remove all WhiteListxxx API
- Add Set() to 'org.freedesktop.DBus.Properties' interface to
  'com.intel.dLeynaServer.Manager' root interface

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Property] Add 'Never Quit' property to Manager

It is now possible to manage the 'Never Quit' option via
the Set() methode.

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Release] Version 0.4.0

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