Adding JSONAssert dependency

pom.xml

[...] 
    <dependency>
      <groupId>org.skyscreamer</groupId>
      <artifactId>jsonassert</artifactId>
      <version>1.5.0</version>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>com.vaadin.external.google</groupId>
          <artifactId>android-json</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
[...]