various fixes for spell-checker
- fixed error on python 3.4+ where an attempt to call x.decode on line 82 failed; this decode operation was removed as it appears unnecessary
- added new command-line option to limit the number of feedback items
returned by the tool
- this number is arbitrarily set to 256 in the toolList.json file, but can be changed; I added this optional limitation because I noticed large quantities of feedback items significantly slow down processing