Bugfix for "nested => [:posts]" in ruby 1.9.2#1

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toastkid wants to merge 1 commit intojnewland:masterfrom toastkid:master

Commits on Jun 14, 2011

Bugfix for how the nested parent class is calculated from the :nested option in ruby 1.9.2, which has a different Array#to_s method to previous ruby versions
toastkid
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