Add external DNS name modify endpoint (#35)

Update README to use access key example

Add new with access key method (#27)

Add user roles endpoints (#24)

* Add user roles read endpoints

* Run tests on push

* Add user role creation methods

Merge pull request #22 from duffn/duffn/add-roles

Merge pull request #20 from duffn/duffn/get-user-details-endpoint

Merge pull request #19 from duffn/duffn/refactor-get-users

Refactor getting users