Form style updates

Changed border style/color. Added white background to form items. Changed input width. Fix radio/checkbox size.

**Before:**
![image](https://cloud.githubusercontent.com/assets/706039/3343193/506de32a-f89c-11e3-8b06-269d1ab4ac32.png)

**After:**
![image](https://cloud.githubusercontent.com/assets/706039/3343201/629345d6-f89c-11e3-8b98-958781e2a9ef.png)