remove log4j dependencies (#1675)

* 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

* use standard logbook.xml

* remove log4j dependencies

spring-apache-camel/src/main/resources/log4j.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
-<log4j:configuration debug="true"
-	xmlns:log4j='http://jakarta.apache.org/log4j/'>
-
-	<appender name="console" class="org.apache.log4j.ConsoleAppender">
-	    <layout class="org.apache.log4j.PatternLayout">
-		<param name="ConversionPattern"
-		  value="%-5p %c{1}:%L - %m%n" />
-	    </layout>
-	</appender>
-
-	<root>
-		<level value="WARN" />
-		<appender-ref ref="console" />
-	</root>
-
-</log4j:configuration>