Merge pull request #1 from sofa/nick

feat(*): convert birthday, switch to new address format, attach pseudoca...
chore(contributing guide): updates contributing guide
feat(*): add FormatUtils with zeroFill
fix(Gruntfile): fixes license banner
fix(LICENSE): fixes naming
chore(*): release 0.3.1
feat(docheckoutst): switch to new API, check for redirects at pre- and post-checkout, pass payone only when available