Add custom transpiler to fix 'failed to load package' issue

This patch adds atom-ts-transpiler and TypeScript as dependenies,
circumventing the issues that have been occuring in recent versions
of Atom where TypeScript source files would fail to be loaded.

Closes jakesankey#45, jakesankey#46.

lib/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "es2016",
+    "lib": [
+      "es2016",
+      "dom"
+    ],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "baseUrl": "../",
+    "strict": true,
+    "newLine": "lf",
+    "removeComments": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "forceConsistentCasingInFileNames": true,
+    "types": [ "node" ]
+  }
+}

package.json

@@ -19,9 +19,24 @@
     "atom": ">=0.174.0 <2.0.0"
   },
   "dependencies": {
-    "atom-space-pen-views": "^2.0.3"
+    "@types/node": "^9.4.7",
+    "atom-ts-transpiler": "^1.4.3",
+    "atom-space-pen-views": "^2.0.3",
+    "typescript": "^2.7.2"
   },
   "devDependencies": {
     "coffeelint": "1.16.0"
-  }
+  },
+  "atomTranspilers": [
+    {
+      "transpiler": "atom-ts-transpiler",
+      "glob": "{!(node_modules)/**/,}*.ts?(x)",
+      "options": {
+        "cacheKeyFiles": [
+          "lib/tsconfig.json"
+        ],
+        "verbose": false
+      }
+    }
+  ]
 }