#130 redux refactor (#208)

* mocks for redux refactor - for discussion

* more API design on redux refactor

* add new reuqired dependencies for build

* change babel target to use modern browser

* remove dead code

* remove dead code - joy plots

* checkpoint on redux refactoring

* checkpoint on redux refactoring

* fix mistaken rebase conflict resolution

* dead code removal; add name to dataframe backmap

* rename dataframe to universe

* update eslint config to more closely match prettier

* lint

* more eslint updates to match prettier

* additional config to make eslint match prettier

* add expression data to Universe/World

* remove obsolete reducers

* lint fixes

* more eslint cleanup

* lint

* lint

* fix but in countAllOnes when dimensions gt 1

* lint; do not display name metadata field

* lint; colors refactor

* lint; colors refactor

* update comments

* first cut at regraph and reset

* enable object-curly-braces consistent mode

* lint, handle regraph with no selection

* fix expression scatterplot bugs

* fix regression legend display

* add expression data cache

* remove console logging

* reset cell color on regraph/reset

* remove obsolete server URLs

* rename UniverseV01 to Universe_REST_API_v01

* add additional comments on the varDataCache

* merge universe reducer into controls reducer; simplify initialization-related actions

* use spread operator

* fix erroneous comment

* convert universe and world state to plain objects, and functionalize supporting code (remove ES6 classes)

* use spread operator

* lint

* improve variable names

* rename obsCrossfilter to crossfilter and obsDimensionMap to dimensionMap

* rename controls2 to controls

client/src/reducers/differential.js

@@ -11,29 +11,34 @@ const Differential = (
 ) => {
   switch (action.type) {
     case "request differential expression started":
-      return Object.assign({}, state, {
+      return {
+        ...state,
         loading: true,
         error: null
-      });
+      };
     case "request differential expression success":
-      return Object.assign({}, state, {
+      return {
+        ...state,
         error: null,
         loading: false,
         diffExp: action.data
-      });
+      };
     case "request differential expression error":
-      return Object.assign({}, state, {
+      return {
+        ...state,
         loading: false,
         error: action.data
-      });
+      };
     case "store current cell selection as differential set 1":
-      return Object.assign({}, state, {
+      return {
+        ...state,
         celllist1: action.data
-      });
+      };
     case "store current cell selection as differential set 2":
-      return Object.assign({}, state, {
+      return {
+        ...state,
         celllist2: action.data
-      });
+      };
     default:
       return state;
   }