To be *extra* sure. Create a MANIFEST.in as well.

theengineear · theengineear · commit 1b3766d7fe1d · 2015-05-24T16:28:22.000-07:00
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -0,0 +1,2 @@
+include /plotly/graph_reference/*.json
+include /plotly/widgets/*.js

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+include /plotly/graph_reference/*.json`
	`2`	`+include /plotly/widgets/*.js`