Condense status line by removing extraneous separators.

The separators between the sections of different color seemed extraneous to me. The different colors themselves can serve as separators. This frees up several characters, which will allow more of the status line to be visible in smaller terminals.
![statusline](https://f.cloud.github.com/assets/5283042/1037898/ba30d8ae-0f58-11e3-860c-64778aff0e95.png)