angular-formly: Use AngularUI Datepicker & Timepicker

[benoror]

Formly Issue: formly-js/angular-formly-website#23

• Branch: iss15-ui.date-time.picker
  • Datepicker:
    • 3cc1916
  • Timepicker:
    • 3960bbc
  • DateTimePicker (Combined)
    • PENDING
    • Experimenting: http://jsbin.com/gikave/2/edit?js,console,output

apps/scripts/formly/types.js

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Old: json-schema-form/angular-schema-form#355

Old: https://gist.github.com/brettahale/5fe67b3ea3de915537e0