Add urls to package.json
Add `lint` npm script
Indent features
Update a `sourcemap` comment
Add compress option

Close #14
Stop test breaking my balls when I add a newline at the end
minimal cli

Close #10
cli: error when input file is unreadable

Close #13
cli: works with stdin & stdout

Close #11
Close #12
cli: add verbose option
cli: add compress option
cli: add flag to disable features
cli: add watch option
cli: add sourcemap option
Update doc for cli
More badges
Update README a bit