Add requirements and enable simple Python 2/3 compatibility.

README.md

@@ -7,7 +7,7 @@ US 2016.
 
 ## Getting Started
 
-1. Install kivy (via Anaconda or pip)
+1. Install kivy (via Anaconda or `pip install -r requirements.txt`)
 1. Run the game using: `python main.py`
 
 ## License

main.py

@@ -19,7 +19,7 @@ class StrategyGame(FloatLayout):
         super(StrategyGame, self).__init__(**kwargs)
 
         number_of_regions = self.map_rows * self.map_cols
-        for region in xrange(0, number_of_regions):
+        for region in range(0, number_of_regions):
             row = region / self.map_cols
             col = region % self.map_cols
 

requirements.txt

@@ -0,0 +1,2 @@
+Cython
+Kivy==1.9.1