Full code for gfmm, simpson fmnn and its enhanced versions

This release contains source code for the following functions:

• GFMM:
  + Online version
  + Accelerated agglomerative learning
  + Full batch learning (slower and faster versions)
  + 4 versions of ensemble learning of base GFMMs
  + 3 versions of combinations of online and agglomerative learning
• Simpson fuzzy min-max neural network for classification
• Improved Fuzzy min-max neural network for classification:
  + Improved expansion and contraction processes
  + K-nearest hyerboxes selection rule