Adds point system for military power
Instance methods to calculate raw military points

Army, navy and air force equipment and men are worth
points and you add them up for a raw military score
Refactors magic power ceiling values into constants
Bug Fix, missing troop values
Implements relative military power calculator
Creates column & calculator for state's total_power_score
Edits point values to give more accurate power score

Weights population less and navy and airforce more
Merge pull request #10 from ggw215/power_ranking

Military and Total Power Score Calculators