Fixes url for this dao

Added missing /iscore path to the url this dao uses.
Adds starred field to entity

Altered sql table creation to create proper table structure (added
starred coloumn). Also changed base url from java.lang.String data type
to java.net.URI data type.
Adds multichoice adapter for RecyclerViews

This adapter will display items with a title, caption and checkbox. It
is also able to handle multiple item selections.
Adds publisher service and listener

Adds rough implementation of a publisher service. Some methods are
already implemented while others are only stub declarations.
Adds welcome activity and fragments

The activity will show the StarPublisherFragment which will display a
multichoice list of available publishers.