v0.8.1

• Optimized our $bindTo() code base.
• Improved saving deeply nested data structures to Firebase (resolved invalid $$hashKey errors in ng-repeat).
• Can now use $$defaults to set local, default values on synchronized objects.
• Fixed bug which caused $bindTo() to not work with inputs (cursor jumped to end).
• Changing $priority and $value when using $bindTo() now cause the server properly update (they are now stored as _id, _value, and _priority, which trigger updates for $watch()).
• $ fields no longer show up when looping over $asObject().
• Modified $add() to accept $priority and $value meta fields.
• $save() method now notifies listeners registered with $watch().