Fixed checking arguments after call to parse_options, it displays help
and returns nil if wrong option was passed or -h was given.
Merge pull request #128 from soltysh/parsing_args

Fixed checking arguments after call to parse_options, it displays help
Fix git clone with origin-local-checkout -u

- Also update README to show the need for the -u flag to specify github
  username
Merge pull request #129 from detiber/userURLFix

Fix git clone with origin-local-checkout -u