update to 5.12

[henryyan]

• update activiti to 5.12
• set jdk version to 1.6

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5</version>
            <configuration>
                <source>${jdk.version}</source>
                <target>${jdk.version}</target>
                <showWarnings>true</showWarnings>
            </configuration>
        </plugin>
    </plugins>
</build>

[pchartrand]

Thanks for the pointer. Works with jdk-1.8 also. Shouldn't it be inserted directly in the bom.xml ?