chore(package): add all-imports.html to use as a main field (#60)

all-imports.html

@@ -0,0 +1,18 @@
+<!--
+@license
+Copyright (c) 2019 Vaadin Ltd.
+This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
+-->
+
+<link rel="import" href="mixins/field-button.html">
+<link rel="import" href="mixins/menu-overlay.html">
+<link rel="import" href="mixins/overlay.html">
+<link rel="import" href="mixins/required-field.html">
+<link rel="import" href="badge.html">
+<link rel="import" href="color.html">
+<link rel="import" href="font-icons.html">
+<link rel="import" href="icons.html">
+<link rel="import" href="sizing.html">
+<link rel="import" href="spacing.html">
+<link rel="import" href="style.html">
+<link rel="import" href="typography.html">

package.json

@@ -2,7 +2,7 @@
   "name": "@vaadin/vaadin-lumo-styles",
   "version": "1.4.0",
   "description": "Lumo is a design system foundation for modern web applications, used by Vaadin components",
-  "main": "lumo.html",
+  "main": "all-imports.html",
   "repository": "vaadin/vaadin-lumo-styles",
   "keywords": [
     "vaadin",