Hello there.

In that commit:
 - Some functions were added to adapt the code in the file ./supervised/tree.py. to the orange framework.
 - .gitignore added,
 -  pyc files deleted,
 - a typo at line 110
 - And the most important is there was a bug(I hope I fixed it) at line: 74. 
I am not really sure that I fixed the bug(please, let me know if I did't). 
Now it shows almost the same result as 1R does, which is weird. I don't know why.