Wrong version in modules and outdated spring-boot version

[MichaelF25]

I've cloned the repository and tried to verify it via 'mvn verify' but ran into several issues:

• Version of project sub-modules does not match version of project parent
• Version of spring-boot is used also for this project. A separate version should be used here
• org.vaadin.spring:spring-boot-vaadin:1.0-SNAPSHOT is not available (anymore). Current release is '0.0.2.1'

Will file a pull request fixing these issues