0.10.1 - File download improvements

This release contains the following changes:

• Implemented handling of google drive documents.
• Added --use-sub-directories command line option which will tell PatreonDownloader to download every post into its own folder. Folder name can be configured using --sub-directory-pattern command line option. Refer to command list for more information. This solves #19.

Big chunk of the functionality in this release was developed by @JDR-Ninja, thank you!