Added the property parentModel to nested models#1

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samuelsimoes wants to merge 4 commits intodtmtec:masterfrom

samuelsimoes:master

Commits on Jun 29, 2013

Added the property parentModel to nested models
samuelsimoes
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Commits on Jul 11, 2013

Lifting rails dependency
ricardohsd
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Commits on Aug 1, 2013

Merge pull request #1 from ricardohsd/master
samuelsimoes
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Commits on Sep 10, 2013

Handle cases where model.get(relation.key) is undefined
samuelsimoes
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