Aigents Java RS API - Make ratings non-binary in the end

[akolonin]

Existing Aigents Java RS rounds ratings in range [0.0,1.0] to [0,1] in current implementation:
https://github.com/aigents/aigents-java/blob/master/src/main/java/net/webstructor/peer/Reputationer.java#L384

It is assumed Python version may be doing the same.

It is OK for the current stage of the project where we expect input ratings either 0 or 1, but it has to be fixed later for more flexibility.

Will have to fix both Java and Python versions and update unit tests.