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

Agree. `IDBIndexOpenCursorOptions` should be a complete cursor position.

    dictionary IDBIndexOpenCursorOptions {
      IDBKey key, // nullable, default to lower-bound
      IDBKey primaryKey; // nullable, default to first
    }

Using `openCursor` becomes easier. Let the keyRange unchanged and open with different starting position, without requiring keyRange to be met with cursor position. 

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