python2 kernel and variable inspector

[xcix]

When using python2 kernel and variable inspector is enabled, print operator in jupyter does not work with SyntaxError exception. Output of %whos magic contains print_function from future, possibly because of import in the beggining of this file https://github.com/ipython-contrib/jupyter_contrib_nbextensions/blob/master/src/jupyter_contrib_nbextensions/nbextensions/varInspector/var_list.py

[jfbercher]

Should be fixed by #1016