Changed the type of the data property on the IFieldGroup, ITypeOptions, IFormOptionsAPI, and IFieldConfigurationObject interfaces from "Object" to a hash of string to any. While Object was not incorrect, it made use without a cast a type error in all but the most trivial cases.
Changed the types of the ```ITemplateOptions``` properties ```onBlur```, ```onChange```, ```onClick```, ```onFocus```, ```onKeydown```, ```onKeypress```, and ```onKeyup``` from
```TypeScript
string
```
to
```TypeScript
string | IExpresssionFunction
```
string | IExpresssionFunction
The field configuration object supports a property called `ngModelElAttrs` which allows you to place attributes with string values on the ng-model element. It's a straightforward alternative to ngModelAttrs and was implemented as a result of this issue: https://github.com/formly-js/angular-formly/issues/378#issuecomment-127211353
