updated compass

Compass was updated because I had to use `bourbon` and `neat`.
The `1.0.1` version works with octopress normally.

The follow error is happening in version `0.12.2` of compass:
```
error sass/screen.scss (Line 21 of vendor/bower/bourbon/dist/helpers/_linear-angle-parser.scss: Invalid CSS after "      webkit-image": expected ")", was ": -webkit- + $p...")
```