use backend facet date instead of browser-generated one

other minor fixes:
- generate a 404 if lastfm img url is null
- removed noisy "no template found" browser logs
Merge branch 'hotfix/facets-list-ordering-fix'
Merge tag 'facets-list-ordering-fix' into development

facets-list-ordering-fix
allDay-fix
Merge branch 'hotfix/all-day-per-day-fix'
Merge tag 'all-day-per-day-fix' into development

all-day-per-day-fix
removed yury's rebel.xml files
missed that one
Merge branches 'development' and 'feature/updatedSince-calendarDatastoreApi' of https://github.com/fluxtream/fluxtream-app into feature/updatedSince-calendarDatastoreApi