Merge branch 'master' into 'releases/v2-3'

added utf-8 encoding to pom

See merge request !16

pom.xml

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <properties>
+	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
   <modelVersion>4.0.0</modelVersion>
   <groupId>maki</groupId>
   <artifactId>simonstrator-api</artifactId>