mdl-text-field : keep <input> to conserve the possibility to use some attribut as "list"

With the current directive mdl-text-field there is no possibility to have the "list" attribute for the input or "type".
Best would be that the directive must include the input to be able to do so.
Check Lumx project that gives that possibility for example.

Start by locating the mdl-text-field directive and inspect how it currently renders or wraps the input. Compare its behavior with the Lumx project example; done means the directive permits input attributes such as list and type to be used.

Written by the indexing model from the issue text.