* use wrappedJSObject to create style elements in page context
* skip unnecessary polyfills in content scripts
* group all style management stuff in injector
* support all API methods in content scripts
* Add key
* Add: a second index uuid, push changes to sync controller
* Add: sync.js
* Add: tokenManager
* Change: log entire body for http error
* Add: token flow
* Fix: minor
* Fix: move cleanup to stop function
* Add: syncNow
* Update dependencies
* Fix: handle 401 error
* Add: handle 401 error
* Fix: then -> catch
* Add: sync options to options page
* Update db-to-cloud
* Change: make prefs.set return a promise
* Add: disble selector if connected
* Add: update selector state
* Fix: return promise in prefs.set
* Fix: manage complex state
* Fix: handle prefs change
* Change: manage sync status in background
* Add: show current status in the UI
* Add: schedule a faster sync when db changed
* Update dependencies
* Add: include progress in sync status
* Add: more detail status
* Show status text only
* Bump dependencies
* Change: show loaded and total
* Fix: syncTarget is undefined
* Add: google and onedrive
* Fix: token is not reused
* Bump dependencies
* Don't use minified version since it is hard to debug
* Fix: expire time is incorrect
* Change: switch google to code flow
* Bump dependencies
* Change: only modify pref if the initialization success?
* Don't stop the sync if the first sync is not triggered by the user
* Add: implement refresh token
* Change: switch microsoft to code flow
* Add: subtract expire with a latency
* Add: microsoft client secret
* Add: display error message
* Fix: fromPref is not used
* Change: try to revoke the token when log out
* Add: revoke dropbox token
* Fix: Google only generates one refresh token for one user by default
* Bump dependencies, fix onedrive list issue
* Fix: arguments sent to sync.put is wrong
* Fix: don't schedule a sync on db changed if not connected
* Bump dependencies. Fix issue of switching drives
* Bump db-to-cloud, fix switching drive issue
* Fix: only auth user on 401 error, don't display login window without user interaction
* Fix: don't call revoke() if token is undefined
* Add: login button to generate the access token interactively
* Fix: make addMissingProperties a local
* Fix: store missing props in an object
* Fix: sync.getStatus should be sync
* LATENCY -> NETWORK_LATENCY
* Fix: cache the token forever if there is no expire time e.g. dropbox
* Add some comments
* Fix: i18n
* Fix: i18n sync status
* fixup! Fix: i18n sync status
* Fix: 'sync to cloud' is displayed twice
