add raw and toJSON methods for model and collection

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>
remove selection support mixin, fix controller test in enyo.DataRepeater, allow binding into the "data" property of enyo.Collections

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>