StatsAggregateSerializer (itacloud-2745)
QuotaStatsView (itacloud-2745)
docs (itacloud-2745)
quota stats url(itacloud-2745)
quota serializer correction (itacloud-2745)
quota factory initiates quota with MiB values (itacloud-2745)
tests for quota stats (itacloud-2745)
corrections in quota stats view and serializer (itacloud-2745)
Merge branch 'develop' of code.opennodecloud.com:nodeconductor/nodeconductor into feature/itacloud-2745
test for uuid-filtering added (itacloud-2745)
Cleanup
Merge branch 'feature/itacloud-2745' into 'develop'

Feature/itacloud 2745 (quota stats)

quotas and quotas usage statistics, aggregated by projects/project_groups/customers.