Fix in UniqueTogetherValidator to allow it to handle querysets#2575

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miki725 wants to merge 3 commits intoencode:masterfrom miki725:master

+8-2

Commits on Feb 19, 2015

fix in UniqueTogetherValidator to allow it to handle querysets
miki725
committed

Commits on Feb 20, 2015

explicitly importing QuerySet to fix failing import in older Django versions
miki725
committed
using SQL in exclude() vs manually compiling pks to exclude
miki725
committed