Add .exercism directories to .gitignore
Add .exercism directories to .gitignore

pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff,pdbartlett/misc-stuff