Add IDEA setting

see http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-reload-springloaded-gradle-and-intellij
chmod u+x gradle.build
Add IDEA files to .gitignore
Fix IDEA setting in build.gradle
Fix indents
Upgrade spring-boot to 1.1.0
Add a controller method which returns json

Also add jackson-databind in build.gradle
Add a controller for web page using thymeleaf
Add *.log to .gitignore