Improve scripts load system

vendors/es6-promise-polyfill/CHANGELOG.md

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+## 1.2.0 (December 8, 2015)
+
+- Support for IE8 and below
+- Promises/A+ tests added
+
+## 1.1.0 (October 16, 2015)
+
+- Change way to get reference to `global`, since `Function()()` may be prohibited
+- Add AMD support
+
+## 1.0.1 (September 14, 2015)
+
+- Fix exports - use polyfill only if native implementation isn't supported
+- Add license
+
+## 1.0.0 (June 19, 2014)
+
+- Init release