Checkin on Periodic Gaussian EM
Checking in some additional Periodic Gaussian code
dldu and dlds in periodicGaussian seems correct now.
Completed Bisection Algorithm to solve 0=dlds(sk, 0)
Unit tests for EM on Periodic Gaussians
Finished periodic gaussian mixture root finding and bracketing algorithms. Finished testUnimodalPeriodicGaussian unit test.
Added more exceptions in constructor
Removed extraneous cout