Add djoser to authentication docs.
Add to main 3rd party resources list.
Merge pull request #1959 from konradhalas/add-djoser-to-docs

Add djoser to authentication docs
Add docs regarding linking third party packages
Merge pull request #1967 from jpadilla/master

Add docs regarding linking third party packages
Maintain order of views on router for api root view.
Used Django utils SortedDict instead of stdlib's OrderedDict for
wider compatability.
Merge pull request #1969 from erikcw/ordered

Maintain order of views on router for api root view.