remove log4j properties (#1662)

* upgrade to spring boot 1.5.2

* add full update to REST API

* modify ratings controller

* upgrade herold

* fix integration test

* fix integration test

* minor fix

* fix integration test

* fix integration test

* minor cleanup

* minor cleanup

* remove log4j properties

xstream/src/main/resources/log4j.properties

@@ -1,14 +0,0 @@
-# Root logger option
-log4j.rootLogger=DEBUG, file
-# Redirect log messages to console
-# log4j.appender.stdout=org.apache.log4j.ConsoleAppender
-# log4j.appender.stdout.Target=System.out
-# log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
-# log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
-# Redirect log messages to a log file, support file rolling.
-log4j.appender.file=org.apache.log4j.RollingFileAppender
-log4j.appender.file.File=D:\\Test\\xstream-application.log
-log4j.appender.file.MaxFileSize=5MB
-log4j.appender.file.MaxBackupIndex=10
-log4j.appender.file.layout=org.apache.log4j.PatternLayout
-log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n