Minor fixes, API change

- Minimizing DOM repaints/reflows due to pagination control rendering by keeping it out of the DOM until adding listeners
- Changed the return value from `data.batch()` deferred to be the record set
- Removed redundant ops from `data.sort()`
- Deprecated & removed `regex.nil`
- Created `data.join()` to perform INNER JOINs of two `DataStores`
- Updated docblocks