Enable importHelpers TypeScript compiler option

This prevents helper functions such as __awaiter, __decorate, etc. from
being emitted into each and every file that needs them (resulting in
multiple copies of the same helper functions all over the code base),
and imports them from the new `tslib` module instead.

More details at microsoft/TypeScript#3364 (comment)

Author: enlight

app/package.json

@@ -44,6 +44,7 @@
     "react-addons-shallow-compare": "^15.3.2",
     "react-dom": "^15.3.2",
     "react-free-style": "2.2.0",
-    "react-virtualized": "7.2.0"
+    "react-virtualized": "7.2.0",
+    "tslib": "^1.0.0"
   }
 }

app/src/common/tsconfig.json

@@ -2,6 +2,7 @@
     "compilerOptions": {
         "module": "commonjs",
         "target": "es6",
+        "importHelpers": true,
         "noImplicitAny": true,
         "sourceMap": false,
         "declaration": true,

app/src/main/tsconfig.json

@@ -2,6 +2,7 @@
     "compilerOptions": {
         "module": "commonjs",
         "target": "es6",
+        "importHelpers": true,
         "noImplicitAny": true,
         "sourceMap": false,
         "declaration": true,

app/src/renderer/tsconfig.json

@@ -3,6 +3,7 @@
         "module": "commonjs",
         "target": "es6",
         "jsx": "react",
+        "importHelpers": true,
         "noImplicitAny": true,
         "sourceMap": false,
         "declaration": true,

package.json

@@ -59,7 +59,7 @@
     "shelljs": "^0.6.0",
     "ts-node": "^0.7.3",
     "tslint": "^3.15.0-dev.0",
-    "typescript": "^2.1.0-dev.20160831",
+    "typescript": "^2.1.0-dev.20160929",
     "typings": "^0.8.1",
     "vulcanize": "^1.14.8",
     "yargs": "^4.7.0"