Revert "have ActiveModel Serializers cache themselves"
Revert "have ActiveModel Serializers cache themselves"

This reverts commit 9262d2e1e8a3f034c33d24d1528402f670f2cae9.

brechtvdv/transitland-datastore,brechtvdv/transitland-datastore,transitland/transitland-datastore,brechtvdv/transitland-datastore,transitland/transitland-datastore,transitland/transitland-datastore