add autoprefixer related to #24
update server task name to serve related to #26
add tests for autoprefixer option.
add autoprefixer option and only include autoprefixer if selected.
remove autoprefixer from generator package.json.
add test for autoprefixer in package.json
place if's inline for better output.
git add autoprefixer to the outputted package.json.
Merge pull request #27 from Poltergeist/feature/autoprefixer

Feature/autoprefixer

Nice. Thanks @Poltergeist