Missing blurlistener/focuslistener for text fields

[tdekoning]

Regular text fields in angular have the ng-blur and ng-focus attributes, but they seem to be missing in this library. They should work the same as the ng-change of the checkbox directive.

Is it possible to add them?

[Frank3K]

I think these directives should be added to the <input> element that is generated for the <md-text-field>. Note that there are more directives that need this (e.g ng-change) in order to work as expected.

[Frank3K]

Also, properties like ng-minlength and ng-maxlength are not set on the corresponding <input>.

[ajoslin]

#547