Added Header Table pour Top Down
added HeaderTable Builder
added Require for HeaderBuilder
Added HeaderTable building method to FpTree
Added TopDown FpGrowth to Miner
Added OpenData Test for TopDown
End test pattern base extractor
Merge branch 'master' of ssh://bitbucket.org/dcavailles/fp-growth-ruby
fixed bugs
fixed bugs
formated test output
Updated readme
added easy interface
level up
Updated readme