Update trivial front-end libraries.

The child of #1476. Look at [this comment](https://github.com/cargomedia/CM/issues/1476#issuecomment-64949937). Depends on #1483.

- [x] jquery.ajax.retry.
- [x] jquery.blockUI.
- [x] jquery.imagesLoaded.
- [x] jquery.select2.
- [x] jquery.transit.