allow user to request an IP address when a network is created.  Including BDD test for function.
Merge pull request #247 from cloudedge/pull-req-master-5a75eba6eb8ed557dfb21f1c50c4eef5c4188bcd

https://github.com/crowbar/barclamp-network/pull/247

Merged by devtool for VictorLowther