Re: [IndexedDB] Add openCursor(key, primaryKey) and continuePrimaryKey (#14)

What should the behavior of `continuePrimaryKey()` be with `"prevunique"` iteration? Given this index:

* r1 = key: 'a', primary key: 1
* r2 = key: 'a', primary key: 2
* r3 = key: 'b', primary key: 1

If direction is "prevunique" and the cursor is at r3, `continue('a')` is specified to end up at r1 (the _first_ record with matching key).

Cases: 
* If direction is "prevunique" and the cursor is at r3, `continue('a', 2)` should end up at... ?
 * r2 seems to make the most sense here
* If direction is "prevunique" and the cursor is at r3, `continue('a', 'a3')` should end up at... ?
 * to me, r2 seems sensible here, but my intuition may be wonky




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