Made parser a little faster :-/
Made parser much faster using pegjs cache
Implemented recursive property access
Cleaned up from peformance tuning
Added order of operations test
Misc housekeeping
Allow filter expressions everywhere (again)
Added range global macro
Added conditional scopes
Refactoring scope
Refactored Stylesheet class out of Scope class
Refactored Stylesheet class out of Scope class
Refactored Scope constructor
Refactored scope evaluation
Factored statements out of scope into their own classes