Several changes#4

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mangust404 wants to merge 4 commits intomla:masterfrom

mangust404:master

Commits on Apr 28, 2015

added posibility to specify order by primary key
postgres
committed
Subquery-friendly limit rules.
mangust404
committed
Support of nested tables
postgres
committed

Commits on Apr 29, 2015

Binmode doesn't like utf-8
mangust404
committed