Behave more like rails 3 fixes #15#17

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grosser wants to merge 2 commits intorails:masterfrom

grosser:rails3ish-rails

Commits on Sep 11, 2012

make tests run instantly + on 1.9 + via rake + via documented dependencies
grosser
committed
make sub! etc work like they do in rails 3 by copying the implementation
grosser
committed