Week6 （August 05 - August 11）

Last week：

1. Improve some css.
2. Add delete topic function.
3. Add file libray.
4. Add picture zoom preview.
5. Add top topic.

Fix many bugs.

Next week：

1. Improve top topic.
2. Add balance related leaderboard.
3. More functions related to phone.

Find and Fix more bugs.