change "overriden" to "overridden" in two places.
Merge pull request #3407 from brianjscoles/master

spelling: change "overriden" to "overridden" in two places. #2325 redux.
Fix fetch success callback to not reset model/collection if HTTP "304 Not Modified" is received.
Merge pull request #3410 from kperry42/http304-fetch

Fix fetch() to properly handle HTTP 304 "Not Modified"
Revert "Fix fetch success callback to not reset model/collection if HTTP "304 Not Modified" is received."

This reverts commit ea24e0a20d5114deb5acbdef0a6be625d7cd3831.