Added: Dropbox API.
Implemented: Dropbox.
Implemented: missing operations in file and folder in google.
Fixed: crash on calling build of the root without having a root loaded.
Fixed: creating folders using path.
Improved: faster initial loading of the CSP.
Improved: moved creating folders using path to abstract class 'Folder'
-- implementation independent.
Improved: moved the download and upload thread creation, the folder
download, and folder upload to the abstract class 'CSP' --
implementation independent, and created a new method to handle the API
specific stuff for transfers.
Improved: cleaned up exception handling.
Changed: removed threading and made containers thread-safe.