Fixed ipynb.py
Fixed ipynb.py

Changed return value of _print_html() from chart.container + chart.jschart to chart.htmlcontent, since chart.buildjschart() is no longer functional.
yelster/python-nvd3,oz123/python-nvd3,liang42hao/python-nvd3,liang42hao/python-nvd3,Coxious/python-nvd3,oz123/python-nvd3,vdloo/python-nvd3,liang42hao/python-nvd3,vdloo/python-nvd3,vdloo/python-nvd3,pignacio/python-nvd3,BibMartin/python-nvd3,yelster/python-nvd3,pignacio/python-nvd3,yelster/python-nvd3,Coxious/python-nvd3,oz123/python-nvd3,pignacio/python-nvd3,BibMartin/python-nvd3,BibMartin/python-nvd3,Coxious/python-nvd3