Changes in BaseEntity and Collection entity
Added method for Token refreshing
Added synchronization button
changes in item entity
added: sending new and edited collections to server
Added progress bar during synchronization; Resolved a few issues
minor changes in synchronizationService
changes in model due to deletion handling
changes in removal handling
fixed minor issue
Added: pushing local changes to server/code refactoring
minor changes
added dropping tables after login to a different account
Added: collections synchronization
fixed issue with server's url cache
Added items synchronization
Added Media Synchronization
Merge pull request #7 from blstream/dev-synchro

Dev synchro