Convert to uniform `properties` object

[ssorallen]

• Computed properties now live as computed
• Multiple computed properties can call the same method with different args
• Default values go to value instead of configure
• configure is gone

[cdata]

I'm gonna take a look at this after get a chance to have a run down with core about the changes.

[ssorallen]

@cdata Cool thanks. I'll wait to hear more about the properties object as well.

[cdata]

:+1: LGTM