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Add full support for rails 4.0 and 4.1
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Force integer type on depth result or nil if undetermined
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Fixed query building bug in #nodes_within
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Clean up default scope methodology within nodes_and_descendants (fixes scope smashing issues in rails 3)
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Clean up #depth implementation to be direct instead of incurring AR overhead
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Use ordered hashes when building nested descendants (.nodes_and_descendants method)
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Only apply dynamic depth ordering to descendant scoping
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Remove deprecated #to_a references
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Remove depth ordering from tree building query
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Fix spelling errors (thanks Jesse)
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Allow restricting results to given depth
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Load properly within rails if provided via rubygems (bundler)
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Allow nodes_and_descendents to accept no base nodes resulting in complete build of all trees
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Add default max depth to catch runaway recursions (can be turned off by setting :max_depth to nil)
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New class method nodes_and_descendents
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Updated instance method #descendents to call class method nodes_and_descendents
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Initial release