Re-write main activity, add high score/help pages, re-design main welcome page and etc.

1. Change App Icon

2. Re-design some of the activities (mainly The MainActivity), fix any crashes or problems with main activity.

![1](https://f.cloud.github.com/assets/5419442/1526553/e23e5bf4-4be5-11e3-85a5-9dcf70bd6a6a.jpg)

add alertdialog for choosing game

![22](https://f.cloud.github.com/assets/5419442/1526560/029e4a12-4be6-11e3-9698-261b48a605a3.jpg)

3. Add high score pages
4. add help pages

5. remove some unused classes and related files