Bad color names in multi-label branch

[renxinhe]

olive and teal are not accepted color names. The third and fourth bounding boxes don't show up as a result of this. main.py line 19 need to be modified to include valid Tkinter colors.

[DennisFaucher]

Same

Traceback (most recent call last): File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1547, in call return self.func(*args) File "main.py", line 296, in prevImage self.loadImage() File "main.py", line 223, in loadImage outline = COLORS[(len(self.bboxList)-1) % len(COLORS)]) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 2337, in create_rectangle return self._create('rectangle', args, kw) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 2316, in _create *(args + self._options(cnf, kw)))) TclError: unknown color name "olive"