Script to update mil_ws on the vehicle

[David Santiago Soto]

It is very easy to forget to pull the latest code from one of our master branches into the sub.

A script should be made to automate this, so it's one less thing to worry about before pool days.

It should do the following:

• Rename SubjuGator and mil_common to <repo_name>_<current_date> (only repos in mil_ws)
• Clone the latest mil_common and SubjuGator repos
• Print out the HEAD commit hashes of all of the newly cloned repositories (including submodules)

[Anthony Olive]

This should be fairly simple, I will add -p and --pull flags to wsmux.

[Anthony Olive]

This was added in uf-mil/mil_common#54.