add optional bluebird coroutine transformer - @phpnode

test/fixtures/transformation/optional-bluebird-coroutines/basic/actual.js

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+var foo = async function () {
+  var wat = await bar();
+};

test/fixtures/transformation/optional-bluebird-coroutines/basic/expected.js

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+"use strict";
+
+var _interopRequire = function (obj) {
+  return obj && (obj["default"] || obj);
+};
+
+var Bluebird = _interopRequire(require("bluebird"));
+
+var foo = Bluebird.coroutine(function* () {
+  var wat = yield bar();
+});

test/fixtures/transformation/optional-bluebird-coroutines/options.json

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+{
+  "optional": ["bluebirdCoroutines"]
+}