feat(imports): deprecate axios (#2542)

* feat(imports): deprecate axios

* add back axios

* fix ie11

* remove added file

lib/core/imports/index.js

@@ -1,3 +1,4 @@
+// @deprecated (axios)
 import axios from 'axios';
 import { CssSelectorParser } from 'css-selector-parser';
 import doT from '@deque/dot';

lib/core/utils/parse-crossorigin-stylesheet.js

@@ -1,4 +1,3 @@
-import axios from 'axios';
 import parseStylesheet from './parse-stylesheet';
 import constants from '../constants';
 
@@ -21,21 +20,28 @@ function parseCrossOriginStylesheet(
 	importedUrls,
 	isCrossOrigin
 ) {
-	const axiosOptions = {
-		method: 'get',
-		timeout: constants.preload.timeout,
-		url
-	};
-
 	/**
 	 * Add `url` to `importedUrls`
 	 */
 	importedUrls.push(url);
 
-	/**
-	 * Fetch `cross-origin stylesheet` via axios
-	 */
-	return axios(axiosOptions).then(({ data }) => {
+	return new Promise((resolve, reject) => {
+		const request = new XMLHttpRequest();
+		request.open('GET', url);
+
+		request.timeout = constants.preload.timeout;
+		request.addEventListener('error', reject);
+		request.addEventListener('timeout', reject);
+		request.addEventListener('loadend', event => {
+			if (event.loaded && request.responseText) {
+				return resolve(request.responseText);
+			}
+
+			reject(request.responseText);
+		});
+
+		request.send();
+	}).then(data => {
 		const result = options.convertDataToStylesheet({
 			data,
 			isCrossOrigin,