Disable some features with flags

[rsahara]

By default, the LicensePlist loads Cartfile, Mintfile, Pods, if the files exist.

However, in big projects there may be multiple build targets, and some of the build targets may not require all the tools/libraries declared in those files.
In this case we would want to use config files, and stop loading the Mintfile, Cartfile etc.
For now the only way I found to disable loading Mintfile was specifying an invalid file path, e.g. --mintfile-path INVALIDFILE.
It would be nice to have an option for this, e.g. --config-path config-that-contains-mintfile-stuff.yml --disable-mintfile.