Install script for 2018

[RustyBamboo]

It'll be better if the install script for each year is stored in that year's repo. Currently the 2018 install script is not in the repo, and the installation relies on 2017's install script.

[OrangeHoopla]

Just finished updating the installation script, still needs to be tested. Most likely will get Kevin04125 to test it on a VM.