Error Panel Formatting

I changed the error panel to be a little easier to read. I made the second line contain the relevant line from the file, if it is already open. ~~I'm not sure how we would do it quickly if the file isn't already open.~~

This pull request includes the osx one because I couldn't work without it. Please review the other one first. 

EDIT: I made it open all the files so it can get the relevant line from each

![screen shot 2013-09-05 at 12 17 50 pm](https://f.cloud.github.com/assets/16249/1090473/7ccabe0c-1657-11e3-912f-337097876355.png)