We implemented Shop function!

For week 9, we made a lot of progress. 

Last week, we created the player inventory class and shop class, and this week we actually made them work in games.

After each level of game or during pause, players can choose to spend currency to buy power up items to make the game easier. For example, if they do not have much time left and really want to win the game, they can purchase the power to stun the tiger. Also if they just want to become rich, they can buy the double currency power. 

I believe the game is more fun and playable after those power up implemented. Moreover, everyone is contributing very hard on the game. I feel lucky to have you guys as teammates :D

Here is how the shop look like: later Evan will change the shop icon so it will look better. Change some icons and make some adjustments to the interface.

Good job everyone!