adjust .gitignore
add build.gradle and gradle wrapper
add missing files from last commit
adjust build.gradle
add settings.gradle
add initial sample implementation
Merge branch 'master' of github.com:knacht-net/spring-boot-vaadin-bootstrap
refactor modules
add newline
refactor multi-module, add quickstart
Merge branch 'master' of github.com:knacht-net/spring-boot-vaadin-bootstrap