Implement integration tests

These integration tests assume that you have installed the minimal index at `/var/local/tmfcore` as described in the README.md file, that you are going to run tmfcore using either Tomcat 8 or a specific version of jetty-runner, and that you have Python 2.x installed for running the tests.

Tested on my testing machine using both Tomcat 8 and jetty-runner 9.2.5...