First attempt at switch user for admins.
Added version 1.0.13 of ORCID message schema.
Updated schema references in test files to point to new version.
Upgraded some test files, which were out of date.
Changed method for getting orcid type to return null if no profile found
(rather than throw exception).
Simplified logic for admin switch user permissions check.
Merge pull request #187 from ORCID/dev-adminSwitchUser

Dev admin switch user