Added logic for if you have the required resources to buy a specific ship.
You can actually buy your fleet now
fixed bug where it would only buy 1 if you already owned the ship but use resources as if you bought the amount your selected
Updating how asteroids are generated in hopes of making them cool and random.
oops, one too many closing curly braces
Added randomized resources on asteroids based on proportions of difficulty you set on the items.  Also fixed bug where it would add the wrong resource to player if it was mining the last of the resource from the asteroid.
Merge branch 'spaceMining'