Add generated gflib.js under typescript/js. Add deprecation notice in javascript.

src/runtime/javascript/DEPRECATED.md

@@ -0,0 +1,7 @@
+# Deprecation notice
+
+As of June 2019, this JavaScript version of the GF runtime is considered deprecated,
+in favour of the TypeScript version in `../typescript/gflib.ts`.
+
+If you don't want/need TypeScript and are just looking for a ready-to-use JavaScript version,
+see `../typescript/js/gflib.js` which is generated directly from the TypeScript version.

src/runtime/typescript/.gitignore

@@ -1 +0,0 @@
-*.js

src/runtime/typescript/tsconfig.json

@@ -2,7 +2,9 @@
   "compilerOptions": {
     "module": "none",
     "target": "es3",
-    "noImplicitAny": true
+    "noImplicitAny": true,
+    "removeComments": true,
+    "outDir": "js"
   },
   "compileOnSave": true
 }