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ancestry should skip default scopes for some of the node update methods.
Fix three warnings: "parenthesize argument(s) for future version"
Fix bug in restore_ancestry_integrity!, added test to verify we didn'…
…t remove the ancestry from all nodes.
Added class method to sort nodes by ancestry.
Performance optimizations for rebuilding large trees.
Fixes for 1.2.1
Changed test suite to run independently of Rails application
Small addition to last commit.
Updated #arrange to use ActiveSupport::OrderedHash so ordering also w…
…orks in Ruby 1.8.