Touchup Header

Slight style adjustments to make the "find a mentor" and "offer to mentor" links the same width and align them with respect to the heart image.

Also, sets a breakpoint in the CSS for when the screen width is too narrow for the H1 element to display on one line.



Before on the left, after on the right.

At 640px ...
![640px](https://f.cloud.github.com/assets/3628589/1330702/6eb32870-3535-11e3-9abe-d4363e32e159.png)


At 480px ...
![480px](https://f.cloud.github.com/assets/3628589/1330711/a38f826e-3535-11e3-9f0d-24b0e5723b3c.png)


At 320px ...
![320px](https://f.cloud.github.com/assets/3628589/1330713/ab6d1f1e-3535-11e3-9e89-5d5746508116.png)