Attribute equality problem caused by hashCode() that depends on Object.hashCode()

[puneetnanand]

AMIDST team, I am having to work around the problem with Attribute.java:hashCode() calling into stateSpaceType.hashCode() which has no hashCode defined and lets the Object.java:hashCode() get called which in turn uses the memory address that is different for the same state spaces. The Attribute class is also not extensible. So the result isn't beautiful. Please let me know if I am missing something.

[andresmasegosa]

Hi, thanks for point that out. Your are right. We'll have a look at that. But, feel free to make a PR if you think you have a good solution.