error : : 
TypeError: chart.tooltipContent is not a function
---------------------------------------------------
why?
# deprecate function for newer version dependencies.

my environment
---------------------
django v1.10
nvd3 v 1.8.1
d3    v 4.2.0
django-nvd3  v 0.9.7
---------------------
solution
---------------------
1. uninstall nvd3 and d3
2. install  	 nvd3 version 1.7.1   ( d3#3.3.13 )
    bower install nvd3#1.7.1



ps. tracking in demoproject
