Merge pull request #105 from jackykschou/GateUpdates

Gate updates
Merge branch 'develop' into sprint10Merge
Changed the bg size in area 2
updated survival area prefabs, fixed game value reset bug, modified health potion drop rate
Merge pull request #106 from jackykschou/sprint10Merge

Sprint10 merge
Merge branch 'develop' of https://github.com/jackykschou/Capstone2D2014Fall into develop
modify some game balance equations
balanced game
Merge pull request #107 from jackykschou/sprint10Merge

Sprint10 merge
Merge branch 'develop' of https://github.com/jackykschou/Capstone2D2014Fall into develop
updated InputManager and boss prefab
Merge branch 'develop' into sprint10Merge
Merge pull request #108 from jackykschou/sprint10Merge

Sprint10 merge
Merge branch 'develop' of https://github.com/jackykschou/Capstone2D2014Fall into develop
updated InputManager and survival area prefabs
Merge branch 'develop' into sprint10Merge
Merge pull request #109 from jackykschou/sprint10Merge

Sprint10 merge
Merge branch 'develop' of https://github.com/jackykschou/Capstone2D2014Fall into develop
Updated Spawner Trigger Colliders in Survival Area 5
Renamed Survival Areas, Updated Prefab Manager