JDK 9 compatibility

[sjoerdtalsma]

• Add Automatic-Module-Name to manifests
• Build and run with JDK 9.
• Add jigsaw module information.
• Test compatibility.

[sjoerdtalsma]

For reference, see work done on the the travis / maven build for Java 9 in the umldoclet

[sjoerdtalsma]

Maven hints about adding module-info.java while remaining pre-java9 compatible:
https://maven.apache.org/plugins/maven-compiler-plugin/examples/module-info.html

[sjoerdtalsma]

About Automatic-Module-Name:
This blog post describes why that's a good start.

<build>
    <plugins>
        <plugin>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifestEntries>
                        <Automatic-Module-Name>nl.talsmasoftware.enumerables.core</Automatic-Module-Name>
                    </manifestEntries>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>