Add support for --ignore-pattern and --ignore-config jscodeshift options

[vinomanick]

I would like to exclude some of the paths using a config file(like .gitignore) or say a pattern from running the transform using these '--ignore-pattern' and '--ignore-config' jscodeshift supported options. At present codemod-cli doesn't pass these options to jscodeshift.

[rwjblue]

Fixed by #89