Added in updatedSince parameter for CalendarDataStore queries for connector and location data.
Important Note: This hasn't been tested yet so it could likely not work properly
Fixed compilation errors
Merge branches 'development' and 'feature/updatedSince-calendarDatastoreApi' of https://github.com/fluxtream/fluxtream-app into feature/updatedSince-calendarDatastoreApi
Merge branch 'development' into feature/widgets-improvements
finished an initial version of the widgets guide