fix error in restore_ancestry_integrity! introduced in prev. commit
Update lib/ancestry/has_ancestry.rb

Use stabby lambda for named scope in order to be compatible with rails 4 and use ruby 1.9 syntax
forgot some code in previous commit
Removed occurence of ::scoped() call which will be deprecated
Update has_ancestry.rb

used the lambda keyword instead of stabby lambda in order to keep compatibility with older versions
Added several gemfiles to test against multiple versions of activerecord
Updated test environment to use bundler
Updated README
Merge branch 'master' of git://github.com/Systho/ancestry into Systho-master
Merge pull request #1 from stefankroes/master

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