Replaced Dropbox Sync SDK with Core SDK.
Changed all Storage methods to async.
Bug fix: Correct revision is now set when uploading files to Dropbox.
Added more huds and proper error handling.
Bug fix: Temp files are now created in the correct directory.
Bug fix: New revision is now set when uploading databases to Dropbox.
Bug fix: DropboxStorage now calls callback of fetchDatabasesWithCallback only once.
Changed Dropbox app type to full access.
Added support for readonly databases.
Database.name now includes the .sdb file extension.
Added caching support to DropboxStorage.
Typo fix.
Bug fix: .sdb extension is now added to new db's name.
Bug fix: It's not possible to delete readonly dbs now.
Better database sorting. Folders are shown at the top now.
Added confirmation dialog for deleting databases.