Add a model reader / importer utility class which is independent of franca

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When reading a dbus model file we currently use franca's DBusConnector. The 
class brings a dependency to franca, which is not required when just reading a 
dbus introspection file. I propose to create a helper class in the 
dbus-emf-model which can read a dbus introspection file. This would remove the 
dependency to the franca files when just working with dbus.

Original issue reported on code.google.com by [email protected] on 5 Dec 2012 at 1:16