remove redundant style files

build/bin/gen-cssfile.js

@@ -18,6 +18,7 @@ function fileExists(filePath) {
 themes.forEach((theme) => {
   var indexContent = '@import "./base.css";\n';
   Components.forEach(function(key) {
+    if (['icon', 'option', 'option-group'].indexOf(key) > -1) return;
     var fileName = key + '.css';
     indexContent += '@import "./' + fileName + '";\n';
     var filePath = path.resolve(basepath, theme, 'src', fileName);

packages/theme-default/src/index.css

@@ -18,8 +18,6 @@
 @import "./checkbox-group.css";
 @import "./switch.css";
 @import "./select.css";
-@import "./option.css";
-@import "./option-group.css";
 @import "./button.css";
 @import "./button-group.css";
 @import "./table.css";
@@ -42,7 +40,6 @@
 @import "./notification.css";
 @import "./slider.css";
 @import "./loading.css";
-@import "./icon.css";
 @import "./row.css";
 @import "./col.css";
 @import "./upload.css";