Neard: porting to neard v0.14

The dbus interfaces have been adapted to the state of neard v0.14.
Reading from the supported tags works, writing to them works to
a limited extent.

Change-Id: Ib0704c6d951baa31ad58484e0c11534aaad359be
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>