hint/placeholder fix when minLenth:0 focus

**before:** *(note: "Phone" is placeholder and "101" hint behind)*
![image](https://cloud.githubusercontent.com/assets/906846/3406742/fece6360-fd95-11e3-8567-63061f68509f.png)

**after:**
![image](https://cloud.githubusercontent.com/assets/906846/3406726/be50779c-fd95-11e3-8756-d7ecac0f5ee1.png)