Immutables & java8

[gjesse]

I have been looking over the code, and I think it could benefit from something like the following : gjesse@e11c04a

If this is something you'd be interested in, I can take a crack at updating the remaining model classes for it.

Also, is there any chance of updating this library to java8?

[rickfast]

Originally I made this lib w/ Java 8, but there are a number of consumers on older versions of Java.

I'll take a peek at the immutable stuff this weekend and get back at you.

Thanks!

[rickfast]

I like the immutable idea. I wonder if we can do it but leave "get" on the accessors. This is mostly so upgrades to 0.9.8+ aren't painful.