refactor; create parsing package
avoid deprecated methods
use new Tool object
new features require upgrade to ANTLR 4.2.3; including lib.
wow. got "jump to grammar location for matched token" working!
shows skipped tokens now too. create parsing result object. rm unneeded tool/atnfactory. new 4.2.3-dev. Fixed #81.
Merge pull request #112 from parrt/input-to-grammar-map

add "jump to grammar element that matched token" feature.