Hey, All

This is Langton-Ant application in sage2. 

This application's authors are:
Harold Zang
Suyang Zhang

Functions:
1. Users are able to add new ants, the new ants' color are random.
2. Users are able to change ants' speed.
3. Users are able to change ants' size.
4. Users are able to change first ant's color.
5. Users are able to change background color.

Issue:
1. In some special cases, it will show synchronization issue (When high way cross screens, it will not sync).
2. Too big size (More than 6 * 4 screens), it will breakdown sage2 application.