New release bugfix release 1.3.2

Wed Jul 04, 2012 by Dimitri De Franciscis

bugfix to BaseConceptActivator.calculateNextOutput() on null or NaN inputs;
SignumActivator:
- added SignumActivator.Mode enum: BIPOLAR (default) and BINARY;
- added zeroValue property, to let users customize value at zero input;
update FcmIO to load and save SignumActivator.mode;
Concept: implemented equals() / hashCode();
small fix to SimpleFcmRunner
BaseConceptActivator: check threshold parameter;
simpler and easier tests for concept activators.