updated some local member variables in BMLNNV
some minor method updates to the HiddenLayer in DBNs
added 4 accessor methods to DBN's LogisticRegression
added some base updates to BMLNNV, along w a new dimensionCheck() method
updated DBN's AdaGrad
continued renovation of the DBN's LogisticRegression class
added a method to turn on adagrad in logreg for DBN's
rebuilt feedforward() in BMLNNV
added a new suite of activation functions for DBN purposes