Improvements from @paroi/nextcloud-node-client

[paleo]

Changelog:

• Add ShareType, SharePermission, ShareWith to share API;
• Fix a bug in stat api when used against a folder path;
• Add a new method statForFolder;
• Upgrade dependancies;
• Add docs/ in .gitignore.

We have published our modified version here. We will be happy to mark our package as deprecated when our PR will be merged in the original project.