Wrapper library for low level sass-sys.
This is work in progress. To test that it works run the examples
``` cargo run --example versions
Running target/examples/versions
libsass: 3.1.0-beta.2-2-g420d
sass2scss: 1.0.3
```
``` cargo run --example compile_sass examples/simple.scss
Running target/examples/compile_sass examples/simple.scss
Compiling sass file: examples/simple.scss.
------- css ------
body {
font: 100% Helvetica, sans-serif;
color: #333; }
```