Multiton pattern implementation

Implementation of the multiton pattern used in the test suites.

<dependency>
    <groupId>org.apache.ws.commons.axiom</groupId>
    <artifactId>multiton</artifactId>
    <version>1.2.21</version>
</dependency>

compile group: 'org.apache.ws.commons.axiom', name: 'multiton', version: '1.2.21'

compile 'org.apache.ws.commons.axiom:multiton:1.2.21'

libraryDependencies += "org.apache.ws.commons.axiom" % "multiton" % "1.2.21"

<dependency org="org.apache.ws.commons.axiom" name="multiton" rev="1.2.21"/>

@Grapes(
            @Grab(group='org.apache.ws.commons.axiom', module='multiton', version='1.2.21')
        )

[org.apache.ws.commons.axiom/multiton "1.2.21"]

'org.apache.ws.commons.axiom:multiton:jar:1.2.21'