Moved log4js into dev dependencies
Added uglifyjs in dev dependencies
Changed web storm project name to "Affinity"
Added stub for financial example
Added default and autoIncrement properties to Attribute
Relation affects the default value to attributes
Added clone function to Relation
Added update function to Relation
Corrected bug in Set that would not calculate properly the equality of two sets if there were deleted items in the set
Corrected the Tuple#set method to handle duplicates on update
Added stubs to handle updates in the Composition operator
Implementation of the base relation update, delete and add handlers in the Difference operator
debug helper : Won't throw if log4js is not installed
Added coerce method to Boolean
Added tests to Difference operator
Corrected Join and Product tests