Minor updates to get the project compiling again and bring it to a slightly newer version of Spring Boot

Hi Dave.

In case you want them, here are a couple of fixes to your sparklr-boot project. Switched to spring-security-oauth 2.0.4.RELEASE, as the snapshot dependency had changed, causing the project to fail to compile. Also brought it up to Spring Boot 1.1.8.

Note - I tried to bring it up to Spring Boot 1.1.9, but it would appear that against that version, the AuthenticationManageBuilder is returning a null AuthenticationManager, causing multiple tests to fail. I have spent some time debugging through it, but I'm not familiar with Boot's internals, and so far I haven't worked out the root cause why that is. Hopefully that's not a bug in 1.1.9.

Steve