Nginx Install Largely Moved to Salt

This commit takes much of the functionality out of the bash script that
installs nginx and moves it to the saltstate for nginx. This includes
all functionality that creates directories and clones git projects. It
also switches to the proper branch for the nginx upload module. As of
this commit, the bash script has been modified to remove these tasks,
but has not been fully tested.
Branch Checkout Added - Not Active

This adds a small change to the git salt state that specifies a branch
that is to be checked out for the swipe-framework project. It is still
commented out because something on that branch appears to be causing
problems. Because it is the current main branch for development, this
should be added in the future.