Upgrade to Spring Boot 1.0.1 GA

 - Remove 'FirewallConfig' now that the Actuator endpoint security that
   it added is enabled by default in Spring Boot.
Merge pull request #346 from spring-io/upgrade-boot-1.0.1

Upgrade to Spring Boot 1.0.1 GA
Use forked Java buildpack to use OpenJDK 1.8.0+
Merge pull request #148 from spring-io/jdk8-buildpack

Run site and indexer apps on JDK 8 buildpack
Merge branch 'master' of https://github.com/spring-io/sagan into spring-cloud