WINDUP-369: Be able to focus effort on specific jars in the ear or war

it is looking into ~/.windup/ignore directory, ~/current_windup/ignore directory and the directory specified by the user. It searches for file that ends with windup-ignore.txt . This file just contains regexes on each line that are matched everytime a file is scanned (so even some directories can be marked here)
Needs a class level comment.