Use NODE_ENV=development in dev UMD builds

Author: mjackson

packages/react-router-config/tools/build.js

@@ -24,7 +24,7 @@ exec('babel modules -d es --ignore __tests__', {
 console.log('\nBuilding react-router-config.js ...')
 
 exec('webpack modules/index.js umd/react-router-config.js', {
-  NODE_ENV: 'production'
+  NODE_ENV: 'development'
 })
 
 console.log('\nBuilding react-router-config.min.js ...')

packages/react-router-dom/tools/build.js

@@ -24,7 +24,7 @@ exec('babel modules -d es --ignore __tests__', {
 console.log('\nBuilding react-router-dom.js ...')
 
 exec('webpack modules/index.js umd/react-router-dom.js', {
-  NODE_ENV: 'production'
+  NODE_ENV: 'development'
 })
 
 console.log('\nBuilding react-router-dom.min.js ...')

packages/react-router/tools/build.js

@@ -24,7 +24,7 @@ exec('babel modules -d es --ignore __tests__', {
 console.log('\nBuilding react-router.js ...')
 
 exec('webpack modules/index.js umd/react-router.js', {
-  NODE_ENV: 'production'
+  NODE_ENV: 'development'
 })
 
 console.log('\nBuilding react-router.min.js ...')