Add poelstra3poc: compiling version of poelstra3 (although it doe…

…sn't run, see readme).

poelstra3poc/README.md

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+This tree shows an almost fully working example of having a mix of native and non-Typescript packages.
+
+It is a direct copy of `poelstra3`, and is a proof-of-concept of how external module resolution would work if
+https://github.com/Microsoft/TypeScript/issues/2338 and https://github.com/Microsoft/TypeScript/issues/2839 is implemented.
+
+It has the following relevant changes compared to `poelstra3`:
+* `import ... = require("...");` statements were rewritten from e.g. `myutils` to its 'resolved' equivalent `../typings/myutils/index`
+
+It compiles! (using tsc 1.5.0-alpha)
+
+In contrast to `poelstra2poc`, this one doesn't run in practice, because of:
+```
+$ node ../dist/myprogram.js
+
+module.js:340
+    throw err;
+          ^
+Error: Cannot find module '../typings/myutils/index'
+```
+
+That's to be expected, because we made `tsc` happy by resolving to the typings, but that's not where the `.js` lives.
+
+However, hovering over the `a` and `b` vars in `myprogram.ts` shows correct types!

poelstra3poc/dist/myprogram.js

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+var mylib = require("../node_modules/mylib/dist/index");
+var myotherlib = require('../node_modules/myotherlib/dist/index');
+var a = mylib.myfunc();
+var b = myotherlib.myotherfunc();
+console.log(typeof a.foo);
+console.log(typeof b.foo);

poelstra3poc/ts/myprogram.ts

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+import mylib = require("../node_modules/mylib/dist/index");
+import myotherlib = require('../node_modules/myotherlib/dist/index');
+
+var a = mylib.myfunc();
+var b = myotherlib.myotherfunc();
+
+console.log(typeof a.foo); // string
+console.log(typeof b.foo); // number

poelstra3poc/ts/tsconfig.json

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+{
+    "version": "1.4.1",
+    "compilerOptions": {
+        "target": "es5",
+        "module": "commonjs",
+        "noImplicitAny": false,
+        "removeComments": true,
+        "noLib": false,
+        "outDir": "../dist",
+        "declaration": true
+    },
+    "filesGlob": [
+        "./**/*.ts",
+        "!./node_modules/**/*.ts"
+    ],
+    "files": [
+        "./myprogram.ts"
+    ]
+}