New: Add accessor decorators to AST (fixes #63) (#73)

Author: JamesHenry

tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.result.js

@@ -0,0 +1,4 @@
+class Point {
+    @configurable(false)
+    get x() { return this._x; }
+}

tests/fixtures/typescript/decorators/accessor-decorators/accessor-decorator-factory-instance-member.src.ts

@@ -0,0 +1,4 @@
+class Other {
+    @foo({ baz: true })
+    static get bar() { return this._bar; }
+}