Added newLISP definition and samples

newLISP is a tiny to small (350KB) scripting language based on Lisp syntax
(s-expressions, lists, homoiconic code as data, etc). The newLISP lexer was added to Pygments in 
version 1.5. 

Some example newLISP repositories on GitHub:

- https://github.com/kanendosei/artful-newlisp
- https://github.com/taoeffect/dragonfly-newlisp
- https://github.com/newlisponrockets/newLISP-on-Rockets

newLISP files are currently classified as Common Lisp, to the chagrin of the Common Lisp fraternity... I'm unable to provide any heuristics code to distinguish easily between the two.