Issue #770. The id of a Patient object should be accessible via an intuitive API function.
Issue #770. The id of a Patient object should be accessible via an intuitive API function.
Issue #770. The id of a Patient object should be accessible via an intuitive API function.
Merge pull request #14 from soLEED/issue-770

Issue #770: The id of a Patient object should be accessible via an intuitive API function
Added implementation for `getExternalId()`, fixed invalid implementation of `getId()`