Added spring boot example application that can be used during test efforts

Added use of spring profiles

src/main/java/ca/uhn/fhir/jpa/starter/FhirServerConfigDstu3.java

@@ -7,6 +7,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 
@@ -14,6 +15,7 @@ import javax.persistence.EntityManagerFactory;
 import javax.sql.DataSource;
 
 @Configuration
+@Profile("dstu3")
 public class FhirServerConfigDstu3 extends BaseJavaConfigDstu3 {
 
     @Autowired