- add lit and stringLit implementation to TokenParsers
- change default behaviour of combinatorImpl, it now fails when no implementation is found
-implement number combinator in TokenParser
- implement decimalNumber in TokenParsers
-add range, acceptIf, wildcard and guard combinators
-add ~> and <~ combinators
- add map, filter, ^^^ and withFailureMessage combinators
- add phrase combinator
- implement foldLeft, reduceLeft, foldRight, reduceRight