Merge pull request #2 from th0m4d/gui

Gui
* src/create_histograms_from_gtzan.m:
Merge pull request #3 from th0m4d/traing_with_all

A optional parameter to use all data as training (i.e. for doing stratified cross-validation)
Fix cqt feature creation.
Merge branch 'master' of github.com:th0m4d/wtg into gui
Refactor GUI.