Ignores extracted webapp directories

* Running webapps in-place with for example the maven tomcat7
  plugin will create a folder where the files are extracted.
Adds runnable acceptance tests

* Enables running of mocha tests with zombie, wired against a
  selected URL, passed as a environment variable. This actually
  works, but starting/stopping web-servers is still an issue.

  Solving this gives me severe deja-vu feeling - it's just one
  of those things one does over and over again.