Increased truncation for issue titles on milestone#show

Not sure if this is a problem for anyone else, but I find the 40 character truncation for issue titles on the milestone#show page a bit too short. It makes it difficult to browse and keep track of issues on that page.

I've doubled the character limit to 80 characters. I also re-ordered the title div and the user icon div so that it does not get pushed below the title at the first breakpoint.

Before:
![screen shot 2014-01-06 at 6 34 23 pm](https://f.cloud.github.com/assets/1238532/1855573/9bcd245c-7732-11e3-9b9f-cc83d3e95a4f.png)

After:
![screen shot 2014-01-06 at 7 24 22 pm](https://f.cloud.github.com/assets/1238532/1855575/a15fd9a0-7732-11e3-9214-0d639b9cadd2.png)