Frontend form style improvements

## Register page
### before
![3-before](https://f.cloud.github.com/assets/77759/1605041/d994c976-53cd-11e3-93bc-ec558e5b374f.png)
### after
![3-after](https://f.cloud.github.com/assets/77759/1605043/df50f75e-53cd-11e3-84dd-3c8963b28e2d.png)
## Login page
### before
![2-before](https://f.cloud.github.com/assets/77759/1605045/e5ff8cf0-53cd-11e3-96eb-aaf0374cf658.png)
### after
![2-after](https://f.cloud.github.com/assets/77759/1605047/eb4d7d84-53cd-11e3-98f8-a18388271050.png)
## Product page
### before
![before](https://f.cloud.github.com/assets/77759/1605049/f22c5fc6-53cd-11e3-8d69-51caaae12d82.png)
### after
![after](https://f.cloud.github.com/assets/77759/1605050/f7657dc4-53cd-11e3-90e1-fb488aadaff4.png)