Standardized on double quotes; modified test to output to a file.
Cleaned up test directory
Merge branch 'master' of github.com:jbkirby/css-img-datauri-stream
Merge branch 'master' of github.com:jbkirby/css-img-datauri-stream
Removed unnecessary async dependency
Merge branch 'master' of github.com:jbkirby/css-img-datauri-stream