Integration Tests for plugin usage

[hazendaz]

We are lacking any integration tests. The tests we have are unit based and while they provide great coverage, they do not test in full which leaves a few gaps noticed with deep testing of specific components. As such, we need to build in integration tests (ie maven invoker tests). I'll pick up this work and model it off other maven projects I've worked that do exactly that. Its best to test our own overall project that way which makes it rather isolated and will considerably help when new feature requests come in.

[ctubbsii]

https://github.com/revelc/zookeeper-maven-plugin uses the invoker plugin for basic integration testing if you need a reference.