add optional jscript transformer for basic IE8 compatibility (fixes #1369)

test/core/fixtures/transformation/jscript/options.json

@@ -0,0 +1,3 @@
+{
+  "optional": ["jscript"]
+}

test/core/fixtures/transformation/jscript/simple-class/actual.js

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+class Test {
+}

test/core/fixtures/transformation/jscript/simple-class/expected.js

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+"use strict";
+
+var Test = (function () {
+  function Test() {
+    babelHelpers.classCallCheck(this, Test);
+  }
+
+  return Test;
+})();

test/core/fixtures/transformation/jscript/simple-class/options.json

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+{
+  "externalHelpers": true
+}

test/core/fixtures/transformation/jscript/var-named-function-expression/actual.js

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+var IdenticalName = function IdenticalName(x) {
+  return x;
+};
+
+var DifferentNameA = function DifferentNameB(x) {
+  return x;
+};

test/core/fixtures/transformation/jscript/var-named-function-expression/expected.js

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+"use strict";
+
+var IdenticalName = (function () {
+  function IdenticalName(x) {
+    return x;
+  }
+
+  return IdenticalName;
+})();
+
+var DifferentNameA = function DifferentNameB(x) {
+  return x;
+};