Add try on __main__.py

[arthurazs]

This is an ideia.

Description

Remove raise raise SystemExit(-1), and only raise true exceptions. Handle the exceptions on __main__.py:

dotapatch = Dotapatch(args.file, args.template)

try:
    sys_exit(dotapatch.parse())
except (ExceptionType1, ExceptionType1, ExceptionTypeEtc) as err:
    handle(err)