add the abililty to dump certain keys via --pk and --pkstart#3

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bdols wants to merge 3 commits intofastinetserver:masterfrom

Commits on Jul 12, 2014

Fix for tables that do not have an 'id' column.
Mibou
committed
Fixing broken --all parameter. Updating from latest Django 1.6.x stable dumpdata.py. Rebuilding structure. Adding model name in output messages to understand which model is under progress.
Mibou
committed

Commits on Jul 22, 2015

add --pkstart option for keys greater than that key id, useful for incremental dumps
bdols
committed