[Merge] lp:~thomas-voss/dbus-cpp/add_service_with_custom_name into lp:dbus-cpp

[Thomas Voß]

> Please add a couple of assertions around the behaviour of announcing policy.
> Other than that, looks good. :)

Added a simple test for a signal being invoked in TEST_F(Service, AddingServiceAndObjectAndCallingIntoItSucceeds).
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https://code.launchpad.net/~thomas-voss/dbus-cpp/add_service_with_custom_name/+merge/225332
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