simplify attribute merging, jaccard calculation, and remove all references to attributes and specs in category-related classes
move CategoryBuilder functionality into CategoryNode
Merge branch 'master' into Issue0063
clean up unused imports and variables
remove field aCount from CategoryTree
#68 Feature submission temp fix
#68 "check & refresh" implemented
Merge remote-tracking branch 'origin/master' into Issue0068
Remove count from category, move build logic from CategoryBuilder, put in CRData
Merge branch 'master' into Issue0063
#68 AJAX attributes sorting DONE
Merge remote-tracking branch 'origin/Issue0068'
Merge branch 'master' of https://github.com/prmr/Creco.git into Issue75_RefactorProductRanker
#75 Integrated refactored ProductRanker into ServiceFacade.