Add a link to Better Specs under the Further Reading section
Added rule about before_destroy for issue #7
Merge pull request #110 from daviddavis/before_destroy

Added rule about before_destroy for issue #7
Merge pull request #101 from nicolasmccurdy/better-specs

Add a link to Better Specs under the Further Reading section
Remove any Rails 3 mentions
Remove info about mandatory lambdas in named scopes
Merge pull request #113 from Darkside73/remove-rails3-mentions

Remove any Rails 3 mentions