one-one writable nested modelserializers
Cleanup one-one nested tests and implementation
one-many writable nested modelserializer support
Merge pull request #753 from maspwr/writable-nested-modelserializer

one-many writable nested modelserializer
Update docs with allow_add_remove
Merge pull request #782 from maspwr/writable-nested-modelserializer

Update docs with allow_add_remove
Merge remote-tracking branch 'upstream/master' into writable-nested-modelserializer

Conflicts:
	docs/api-guide/serializers.md
Merge pull request #792 from maspwr/writable-nested-modelserializer

Writable nested modelserializer (merge in master)
Fix model serializer nestesd delete behavior
Merge pull request #796 from maspwr/writable-nested-modelserializer

Fix model serializer nestesd delete behavior
Don't use field when saving related data
Merge pull request #797 from maspwr/writable-nested-modelserializer

Don't use field when saving related data
Merge remote-tracking branch 'upstream/master' into writable-nested-modelserializer

Conflicts:
	rest_framework/tests/relations_nested.py
Fix deprecation warnings in relations_nested tests
Merge pull request #817 from maspwr/writable-nested-modelserializer

Merge master into writable-nested-modelserializer
Allow action decorator to handle multiple http methods
Added Django 1.6a1 to the test matrix.
Use absolute name imports for tests if django version is 1.6+.
Bugfix: Fix run validation layer with invalid data
Added get_url hook to HyperlinkedIdentityField in line with HyperlinedRelatedField.  Closes #883