Fix problem installing on Mojave (Mac OS 10.14)

Users have noted that when installing IGB onto Mac OS 10.14 "Mojave" the OS reports that the downloaded dmg (installer) file is corrupt.

This is likely due to some issues with the install4J software version we are using, as described here:

• https://www.ej-technologies.com/blog/category/install4j/

The fix appears to be upgrading our installer software. Currently, we are using Install4J version 7.0.3.

This will require updating

• Docker container with Install4J - https://bitbucket.org/lorainelab/integrated-genome-browser-docker

And possibly updating:

• Install4J configuration file in IGB code base