Remove ability to block oneself#23

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ryandrake08 wants to merge 3 commits intotcocca:masterfrom

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Commits on Jun 10, 2012

Lock factory_girl to v2.6.0, which is compatible with ruby 1.8
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Lock shoulda to version 2.11.3, because acts_as_follower uses should_change, which has been removed from recent versions of shoulda
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Removed the ability for a followable to block oneself, an act that doesn't make sense given that an object cannot follow oneself
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