Better installMule task.

A better installMule task.  Makes a zip with no version number so that no
matter what versioning scheme is used when the zip is installed to the
testing Mule container it will always just have the project name.

This avoids ending up with multiple version of the same application running
in the Mule server.

Resolves #2
Add version file into zip. Resolves #3
Merge pull request #4 from GeoNet/feature-install-task

Feature install task