Make the project_path variable setable as an --app-dir option on CLI.
Update lib/compass/sass_extensions/sprites/engines.rb

Fix spelling errors
Merge pull request #1164 from charlietran/patch-1

Update lib/compass/sass_extensions/sprites/engines.rb
Merge pull request #1155 from androa/project_path-as-option

Make the project_path variable setable as an option on CLI.
Merge branch 'stable'