Revision 11

-New "events" that affect your gameplay
-New Events.java
-New event icon for notifications
-New event sound effect for notifications
-Volume constant removed
-Advertisements rebalanced
-Fixed "money" achievement
-Added very basic pausing system
-Added Achievement checking for non-progress achievements
-Spread out customers when ads are active to prevent over-crowding
-Tweaked optimal price calculations
-Tweaked temperature/ice calculations
-Tweaked quality change calculations
-Fixed some tutorial issues
-Lowered gameplay music volume
-Lowered notification duration to 7 secs from 10