Everything so far

`method-list` (for adding breakpoints) isn't ready yet because `core-selector`  is buggy.
The plan is to put `method-list` and `object-tree` on the right side in separate tabs. But `paper-tabs` was  not being compliant with `vulanize`, so that's not done yet.

Requires `O.o()` to work.

Thank you
I'd suggest Boolean(descriptor.set) || Boolean(descriptor.get) rather than the ternary. (Note that Boolean(foo) returns a primitive, not a new Boolean wrapper object.)