[Finishes #69230214] start contents in top left when scroll bars enabled

It looks like the code was intentionally written to have buffer space on all sides.  That doesn't seem like what we really want, so I've changed to to align to the top left and provide buffer space on the right and bottom.  Can you think of anywhere else where changing these metrics might get us into trouble that I should verify we don't break?

Image 1 instead of image 2.
![image](https://cloud.githubusercontent.com/assets/1767466/2699255/916d2e48-c404-11e3-9683-4d2d4e3091f0.png)
![image](https://cloud.githubusercontent.com/assets/1767466/2699261/9e0e263e-c404-11e3-8471-10cf60be78ed.png)