Correct colors in Tomorrow Night Eighties Xcode

Colors weren't set properly. Noticed that the colors looked a bit off
compared to Sublime Text and Terminal versions of the Tomorrow Night
Eighties theme I had.

I used Skala Color (http://bjango.com/mac/skalacolor/) to view the hex
codes for the colors in the Xcode theme, confirmed they were a bit off,
and then manually entered the correct hex colors.
Merge pull request #271 from jbrudvik/xcode-colors

Correct colors in Tomorrow Night Eighties Xcode