Set back to reference "cjs" dependency, with yarn focus (#74)

* Set back to reference "cjs" dependency, with yarn focus

This change requires the use of `yarn install --focus" in the perspective-viewer-d3fc folder, if you're only compiling the plugin (so that the dependency with the /cjs folder is pulled in locally)

* Update to work without global install webpack

Must pick webpack 3.5.6 when doing `yarn install --focus`

* Silence webpack error relating to "@d3fc/d3fc-data-join" reference

Author: Andy Lee

packages/perspective-viewer-d3fc/package.json

@@ -52,6 +52,7 @@
         "gradient-parser": "0.1.5"
     },
     "devDependencies": {
-        "babel-loader": "^8.0.5"
+        "babel-loader": "^8.0.5",
+        "webpack": "^3.5.6"
     }
 }

packages/perspective-viewer-d3fc/src/js/d3fc/axis/axis.js

@@ -1,6 +1,6 @@
 import {select} from "d3-selection";
 import {line} from "d3-shape";
-import {dataJoin as _dataJoin} from "@d3fc/d3fc-data-join";
+import {dataJoin as _dataJoin} from "d3fc";
 
 const identity = d => d;