fix(fieldGroup): add shortcut for templateOptions

[hrgui]

The shortcut is expected to be available in the template for fieldGroups now that they accept wrappers.

[codecov-io]

Current coverage is 95.88%

Merging #532 into master will not affect coverage as of 4d82a05

@@            master    #532   diff @@
======================================
  Files           16      16       
  Stmts         1093    1094     +1
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit           1048    1049     +1
  Partial          0       0       
  Missed          45      45       

Review entire Coverage Diff as of 4d82a05

---

Uncovered Suggestions

1. +0.37% via ...alidationMessages.js#25...28
2. +0.28% via src/test.utils.js#38...40
3. +0.28% via ...s/formlyUsability.js#18...20
4. See 7 more...

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[kentcdodds]

Thanks! Looks perfect. A new release should be out in a minute or two.

[hrgui]

No problem. :+1:

[benoror]

Nice :+1: