Added java doc comment for DimpleEvent.printDetails
Implement DiscreteFactor.isDiscrete (minor optimization)
Gibbs solver improvements including support for large discrete factors:

 - Gibbs now works with discrete factors over domains too large to fit
   in factor table.
 - Fixes bug 286
 - Fixes bug 189, but just for Gibbs solver
 - Added new option SolverOptions.maxAutomaticFactorTableSize
 - Added two new events GibbsBurnInEvent and GibbsSampleStatisticsEvent
 - Added FactorFunction.updateEnergy method that can be overridden to speed
   up evaluation to take advantage of previously computed value
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