add SCM status to commit dialog

Please take a look.

For now, just show scm status on commit dialog. 
I'll follow hoa's comment from following PR.

Now blocked to work. because of scm status is disabled.

When enabled, the screen shot is
![image](https://f.cloud.github.com/assets/756988/2357025/64b26312-a5f7-11e3-877f-460721f767c7.png)

@devoncarew, @dinhviethoa