Addition of -C flag 

Not sure if you guys take pull requests through Github, but during a recent fuzzing excursion I ran into a web server that simply didn't respond in the event of a typical 404.  I thought this might be of interest and use to others, as well.

* dotdotpwn.pl
  DotDotPwn/HTTP.pm
  DotDotPwn/HTTP_Url.pm
  -- Added "-C" flag to continue in the event that the web server does
  not respond with 404's when pages are not found.
  -- Fixed some spelling errors :)