Adding showFields functionality	to choices in a	select field. Field names that are part	of the showField array will only be displayed when the select value matches the value of the choice that contains the showField.
Merge branch 'master' of github.com:punkave/apostrophe-schemas

* 'master' of github.com:punkave/apostrophe-schemas:
  append required fields with 'required' pre submission
  minor bump
  removed html5 required logic and added newInstance method