Restore PubSub Producer Exchange Declaration

XD-1786 incorrectly removed the declaration of the exchange
on the producer side.

Although tap producers are not created before consumers, a
named 'topic:' would publish to a non-existent exchange
until a consumer is bound.

Spring AMQP now logs such publications as an ERROR.
Fix bower:install file resolver issue

- Thanks to suggestions from: https://github.com/bower/bower/pull/1403