0.8 property config - #1256

• Renames published configuration object to properties
  • Adds computed field to properties. Replaces use of general computed object
  • Adds observer field to properties. Replaces use of general bind block for single-property observers
  • Adds value field to properties. Each property in properties accepts a value field to define a default value; may either be a static value or function that returns a value (e.g. for initializing objects/arrays); replaces use of general configure function (although general function still exists for exotic use cases)
• Removes general computed configuration object (these must move to properties per property)
• Renames bind to observers (general observers configuration object remains for path and multiple-dependency observers; will still work for single-property observers, although these should generally go in properties)
• Adds multiple-dependency observer support to general observers object
• Fixes attribute deserialization loop when setting reflect: true properties
• Adds attribute deserialization tests

Minimal element changes required for compatibility with this API update:

• Rename published to properties
• Move all computed properties into properties object
• Rename bind to observers

Not strictly required, but should update to match style going forward:

• Move all single-property observers (formerly bind) into observer field of properties object
• Move all default values defined in configure to value field of properties object (and remove configure function)