* Add local bundle commands
- the local bundles take precedence over the built-in ones
- bundle-show lists the bundles
--modules lists the modules in each bundle
- bundle-add adds a bundle from the user/repo github string
it does some level of checking that the repo's and zips URLs exist
- bundle-remove removes a bundle from the local list
* allow overwritting the built-in modules manually
* remove show_bundles_info
* filter github URLs into github repo string
* avoid duplicates if adding built-ins as local, but allow it (to override priority order)
* put bundle-remove --reset back
* small change in bundle-show, local first
* message on built-in in bundle-remove
