Added video entity
Create stub function for uploading a video
Merge branch 'fix_reopen_session_flow'
A working video class entity
Update README.md

Change absolute links to relative links, to ease on developers updating the README and to make it right :)
The change also fixes a link directing to a fork of the repository instead of the current page.
Removed the option to upload a video to specific album
Reason: impossible. All videos are uploaded only to the "Videos" album, always.
New privacy class.
Used to control a single (entity) post privacy.
Added privacy support.
Changed "SetPrivacy" to "AddPrivacy" so it won't be named differently
Update README.md

Add video upload documentation.
Fixed a typo.
Thumbnail feature removed from Video class.
Facebook doesn't support it (or I didn't find a way to do it)
Added addPrivacy comment and cleared unused imports
Custom privacy settings implemented, tested and working already.
Comment changed.
Added privacy option to Photo
Better comments
Added privacy option to Feed
Update README.md

Explain Privacy class usage
Added the ability to add predefined friend lists to the allow list
My code changes reorganized (coding style, some more comments)