Resolve syntax error "Unexpected token this"
Use unbound template to avoid 'Cannot perform operations on a Metamorph that is not in the DOM'

References:
https://github.com/brianreavis/selectize.js/issues/148
http://grosser.it/2012/05/05/a-chosen-js-select-filled-via-ember-js/
https://github.com/miguelcobain/ember-selectize
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