TEXTAREA, setInput, and complex example

I've added a snip to support TEXTAREA as well as INPUT for the single-field flavor.  I also added a 'setInput' method for programmatically setting the value of the tag input field (including adding to README.markdown).

Finally, there is a new example using tags which take an optional numeric value which is appended to them.  The example is a rating system where each tag gets some numeric (1-5 or whatever), but all entered with the keyboard as tags.