Added id3 tree pruning
Minor fixes in decision tree notebook
Merge pull request #2131 from iglesias/develop

Minor fixes in decision tree notebook
sudoku recognizer notebook add to news
	- accented vowels
changes in decision tree pruning method
Merge pull request #2132 from ahcorde/sudoku_ipythonNotebook

sudoku recognizer notebook add to news
minor change in prune_tree documentation
Merge pull request #2128 from mazumdarparijat/decision_tree

Added id3 tree pruning