Simplify Multiton implementation

[iluwatar]

The implementation could be simplified as commented here: http://java-design-patterns.com/patterns/multiton/#comment-3432626979

[gopinath-langote]

@iluwatar - I am working on it.

[iluwatar]

Ok @gopinath-langote

[iluwatar]

@gopinath-langote are you still implementing this?

[gopinath-langote]

@iluwatar : Give me some time. Sorry, couldn't get time to work on this. Please reopen this issue for enhancement so that someone else can also work on this.

Thanks.

[iluwatar]

This issue is free for taking again

[anthonycampbell]

@iluwatar - I am working on it.

[iluwatar]

Ok @anthonycampbell