Merge pull request AltSchool#101 from AltSchool/fix/getattr-bugs

Add default values for getattr

Merge pull request AltSchool#99 from AltSchool/fix/upmerge-1.3

Fix/upmerge 1.3

Merge pull request AltSchool#95 from AltSchool/feature/dynamic-generi…

…c-write-flows

Feature: DynamicGenericRelationField write flows

Merge pull request AltSchool#94 from AltSchool/feature/dynamic-generi…

…c-relation-field

Feature/dynamic generic relation field

Merge pull request AltSchool#85 from AltSchool/feature/moar-router

new router API to allow DREST to map/generate canonical resource URLs

Merge pull request AltSchool#93 from AltSchool/fix-v1.3.x/update-version

bump package version to v1.3.21

Merge pull request AltSchool#92 from AltSchool/fix/serializer-name-op…

…timization

Fix/serializer name optimization

Merge pull request AltSchool#88 from AltSchool/revert-84-feature/seri…

…alized-relationship-prefetching

Revert "support for serializer fields in `requires` for consistent prefetching behavior"

Merge pull request AltSchool#84 from AltSchool/feature/serialized-rel…

…ationship-prefetching

support for serializer fields in `requires` for consistent prefetching behavior

Merge pull request AltSchool#84 from AltSchool/feature/serialized-rel…

…ationship-prefetching

support for serializer fields in `requires` for consistent prefetching behavior