Changes in 1.0.0
  * Added vignette.
  * Included penreg in default list of base learners (imported from EnsembleBase)
  * Modified epcreg to expose new scheduling options offered in EnsembleBase

Changes in 0.7.0
  * Fixed plot method for epcreg to always show horizontal line for CV error (right panel).
  * Added preschedule parameter to training and predict methods for epcreg, with default values of FALSE (dynamic) for training and TRUE (static) for predict.

