Parsing: fixed typos in built-in function names, fixed support for [FIRST], [LAST], [INDEX]
Fixed aggregates {exp1,exp2}
Fixed -expressionForFunction:selectorName:arguments:
built-in functions are now class methods
Cleaned a lot of code in built-in functions
EvaluatedObjectExpression is now a singleton
Merged inserset/minus/union Set into one file
Deleted unused expression subclasses : expression_operator and expression_assignement
Added CPCoding methods and changed key names to match Cocoa
Made KeyPathExpresion a subclass of FunctionExpression like in Cocoa
Tests
CPComparisonPredicate: fixed typo in 'between' operator evaluation, simplified 'contains' and 'in' evaluation.
Added tests in CPPredicateTest for theses fixes.