Fix issues 5 and 6

[halostatue]

• Resolved a Numeric/Integer OptParse issue

  • Resolved an issue with later versions of Ruby not working with an OptParse specification of Numeric; this has been changed to Integer.

• Resolved a problem with bin/ldiff --context

• Resolve ldiff output issues

• Resolves #5 and #6 by adding system-output comparison calls to bin/ldiff compared against some pre-generated output.