Update tpl file and code for create new Beego application

Updates:

1. Shorter name for creating new app: create -> new.
2. New format of prompt for creating new app:
![newapp](https://f.cloud.github.com/assets/2946214/848111/53ac7acc-f453-11e2-98ba-8219d2a97338.png)

3. New tpl file for index.tpl:
![newlook](https://f.cloud.github.com/assets/2946214/848113/6389b784-f453-11e2-82a5-0c4306b1a3ec.png)