add widgets to package

Author: chriddyp

setup.py

@@ -40,7 +40,7 @@ def readme():
                 'plotly/matplotlylib',
                 'plotly/matplotlylib/mplexporter',
                 'plotly/matplotlylib/mplexporter/renderers'],
-      package_data={'plotly': ['graph_reference/*.json']},
+      package_data={'plotly': ['graph_reference/*.json', 'widgets/*.js']},
       install_requires=['requests',
                         'six',
                         'pytz',