Fixes page formatting issues

After downloading Casper, I noticed that there were formatting issues on pages. It looks like this was due to the .post class being styled, which only showed on `post` post types. I changed this class to `.hentry`, which is more generic and seems to apply to more posts.

Also, I noticed that titles appeared twice on pages, so I got rid of the H1 tag and left the H2.

Open to any feedback and requests.

![casper](https://cloud.githubusercontent.com/assets/1126811/2739883/4c1bc02e-c6c1-11e3-8ba8-07107955e08a.png)