much faster data import and fixture generation

Squashed commit of the following:

commit 6da4f11870b98b07270fb335ce8fa64ef44fa77a
Author: Conor Schaefer <conor.schaefer@gmail.com>
Date:   Mon May 26 15:39:04 2014 -0400

    adds benchmark for custom fixture generation

commit 99ee4a61c56edd80e0387999819a74acb63241cf
Author: Conor Schaefer <conor.schaefer@gmail.com>
Date:   Mon May 26 15:16:13 2014 -0400

    implement iterator QuerySet for mem reasons

commit 84219cc1071236d78ff5c046d185631accfa0a91
Author: Conor Schaefer <conor.schaefer@gmail.com>
Date:   Mon May 26 15:02:47 2014 -0400

    adds benchmark times for dumpdata (for reference)

commit c4b409445e28ccc5a549bd419ea6d61617a2d151
Author: Conor Schaefer <conor.schaefer@gmail.com>
Date:   Mon May 26 14:04:53 2014 -0400

    updates README with current counts

commit a559aaee577e691f12012a8f9bd88c69db6bc739
Author: Conor Schaefer <conor.schaefer@gmail.com>
Date:   Mon May 26 13:58:53 2014 -0400

    adds dse for (allegedly) faster imports