Added readOnly option

[jjwilliams]

This will make the input box readonly, and remove the tagCloseIcon from being rendered.

Fairly simple - I might be missing something. Wasn't sure if I should .attr('readonly', true) the field or disable the field. Readonly will still get posted, although I'm not sure why a tagManager's textbox would need to be posted back.

[jjwilliams]

Also I don't know if this is needed: opts.backspace = [];//clear out the ability to delete on backspace chars I guess I have visions of rogue browsers allowing users to type into readonly fields.

[johnnyshields]

Why show the input box at all if in read only mode?

[jjwilliams42]

Good point, I could just hide it altogether. I'll look into that tomorrow.

[jjwilliams]

Hid the textbox if readOnly