Fix tomcat maven repo location and use spring.io
Fix tomcat maven repo location and use spring.io

Fix the maven repo used for tomcat 8 release candidates and update
spring repos from springsource.org to spring.io.

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework