Add support for configuring SSL declaratively

Both Tomcat and Jetty can now be configured to use SSL via the
environment (typically application.properties or application.yml)

Closes #1084

spring-boot-samples/pom.xml

@@ -44,6 +44,7 @@
 		<module>spring-boot-sample-secure</module>
 		<module>spring-boot-sample-servlet</module>
 		<module>spring-boot-sample-simple</module>
+		<module>spring-boot-sample-tomcat-ssl</module>
 		<module>spring-boot-sample-tomcat</module>
 		<module>spring-boot-sample-tomcat-multi-connectors</module>
 		<module>spring-boot-sample-tomcat8-jsp</module>