Update to Spring Boot 1.2.7
Update to Spring Boot 1.2.7

And also use the boot-dependencies-bom instead of definig our own versions.

This should align all used versions and closes #22

joshiste/spring-boot-starter-batch-web,codecentric/spring-boot-starter-batch-web,joshiste/spring-boot-starter-batch-web,codecentric/spring-boot-starter-batch-web