Feature/seqware 1614 arbitrary host

Merge this after pull request #56 

This allows maven to disable the running of an embedded tomcat instance and parametrizes the underlying database via our .seqware/settings allowing us to run our full set of unit and integration tests against both a remote postrgesql instance and/or a Tomcat instance. 

This supports testing on Vagrant (to run through our tutorials on a external postgres and Tomcat) and SPB's CI work (which requires just an external postgres).