Fix #359 - Introduce build system based on Gulp

- Add Gulp and new dependencies to `package.json`
- Add `gulpfile.js` with four tasks:
    - `tsc`: For building TypeScript sources
    - `bundle`: For bundling JavaScript modules in a monolith
    - `sorcery`: For resolving the source map chains back to the original TypeScript files
    - `build` (`default`): Runs the whole `tsc` → `bundle` → `sorcery` chain
- Clean up `Dockerfile`, since `cpio` is not needed any more
- Clean up not needed dependencies from `package.json`
- Remove `bin/build`
- Update `bin/release` to use `npm run build` instead of `./bin/build`

package.json

@@ -38,18 +38,26 @@
     "browserify": "^13.1.0",
     "chai": "3.5.0",
     "docdash": "0.4.0",
-    "exorcist": "^0.4.0",
     "express": "4.13.4",
     "express-ws": "2.0.0-rc.1",
+    "fs-extra": "^1.0.0",
     "glob": "^7.0.5",
+    "gulp": "^3.9.1",
+    "gulp-cli": "^1.2.2",
+    "gulp-sourcemaps": "^1.9.1",
+    "gulp-typescript": "^3.1.3",
     "jsdoc": "3.4.3",
+    "merge-stream": "^1.0.1",
     "mocha": "2.5.3",
     "nodemon": "1.10.2",
     "pty.js": "0.3.1",
     "sleep": "^3.0.1",
     "sorcery": "^0.10.0",
+    "tsify": "^3.0.0",
     "tslint": "^4.0.2",
-    "typescript": "^2.0.3"
+    "typescript": "^2.0.3",
+    "vinyl-buffer": "^1.0.0",
+    "vinyl-source-stream": "^1.1.0"
   },
   "scripts": {
     "prestart": "npm run build",
@@ -58,7 +66,7 @@
     "lint": "tslint src/**/*.ts",
     "test": "mocha --recursive ./lib",
     "build:docs": "jsdoc -c jsdoc.json",
-    "build": "./bin/build",
+    "build": "gulp build",
     "prepublish": "npm run build"
   }
 }