v1.0.0-alpha.4

Added

• Wrappers for group paths of Upload API (group, groupInfo).
• The high-level function for group uploading, aka filesGroupFrom.
• Uploading progress for Node.js in base method.

Changed

• UploadFromInterface was renamed to FileUploadInterface.
• FileProgress was renamed to ProgressParams.
• UploadcareFile was renamed to UploadcareFileInterface.