Responsive fixes, homepage

Fixing "Our code" responsive + clients background:
Full:
![clients-normal](https://cloud.githubusercontent.com/assets/7369740/3101361/b6b5cc32-e632-11e3-829f-f55e35756513.png)

Tablet:
![clients-768](https://cloud.githubusercontent.com/assets/7369740/3101363/bf569b00-e632-11e3-9e6d-9475d08f2c06.png)


Phone: 
![clients-320](https://cloud.githubusercontent.com/assets/7369740/3101364/c4f45e12-e632-11e3-8834-d987105dc2de.png)


Mobile Menu size:
![menu](https://cloud.githubusercontent.com/assets/7369740/3101374/f344359e-e632-11e3-8566-e4529ac8027f.png)


Contact us Mobile fix form size:
![contact-us-phone](https://cloud.githubusercontent.com/assets/7369740/3101381/1d3900f0-e633-11e3-8e80-fa16010b0730.png)