Updated Union artillery locations
Updated Union infantry locations
Created turtle model for artillery
I added a global variable (initDir) and some code to read an additional spreadsheet value from the artillery CSVs. I did this so we can setup the artillery turtles to face a certain direction that's specified in the spreadsheet - that way they aren't all facing random directions.

Russell, you'll probably want to check, but it was working correctly.
Merge branch 'master' of https://github.com/RussellRollins/INTA_4742