MUMNOTPLT-30 : Add initial webservice

* Added in rest web service that takes in a username and a list of groups (space separated for now)
* Created a test case to test a blank
* Modified some config
* upgraded to latest stable build of spring-boot (patch release)

* Updated overlay to pull in `ismemberof` at least to get some groups over to web service so we can show cool things like this:

![image](https://cloud.githubusercontent.com/assets/3534544/3543024/5826db32-085d-11e4-9996-f98bfde1ef2f.png)

Worth documenting that with a comment above the `<entry/>`, say?