Close GH-75: Updating source map testing.
add `imagePath` option

closes #74
fixes #64
various tweaks
0.12.0
call this.async() on error
Merge pull request #76 from whatever-company/master

call this.async() on error
0.12.1
Clean up readme: there is a compression option.
Merge pull request #91 from kylerush/readme

Clean up readme: there is a compression option.
Use bleeding-edge node-sass