Align buffer flags left of the file paths

This moves the buffer flags to the left of the file paths, and aligns them (compactly--whitespace is removed). This makes it easier to see the status of the open buffers.

**Layout after this commit:**
![after](https://f.cloud.github.com/assets/1359421/1186921/3da0464a-2334-11e3-91d0-f86c40e28187.png)

**Layout before this commit:**
![before](https://f.cloud.github.com/assets/1359421/1186920/30ed9024-2334-11e3-9264-ed8563a39e33.png)