Merge pull request #1 from ginlane/import-merch

refactor GridOrder to Classification, added TaxonGrid and versioning concept
fix create grid redirect
fixed taxon_grid relation to snatch up last not first
fixed acts_as_list bug with reverse order copy
added extra ensure for alternative assignment direction
you can suck it acts_as_list callbacks
suck it deprecated uniq: option
suck it order desc override not working
suck it all tests expecting add_new_at: :bottom