OS detection fixing gutter error notifications

[derekwilling]

tested w/ python 3.7.0, windows 10 1809, and MS Edge.

Fixes #29

[ethanchewy]

@DirtySoc

For scoping and to create clearer error messages, let's do something like this:

line_num = None
if os.name == "nt":
        line_num = error.split(":")[2]
else:
       try:
            line_num = error.split(":")[1]
      except Exception as e:
           print(os.name + " not compatible: " + e)

[derekwilling]

updated. let me know if that works!

[ethanchewy]

@DirtySoc That works! Thanks! I'll test it out on my windows and linux systems and merge it later tonight. Thanks!

[derekwilling]

Cool. I'll start working on #26