use --incremental to speed up builds

.gitignore

@@ -41,3 +41,4 @@ tags
 
 proxy.key
 proxy.pub
+tsconfig.tsbuildinfo

package.json

@@ -48,7 +48,7 @@
     "tslint": "tslint --format stylish --project .",
     "format": "prettier --list-different --write `git ls-files --modified *.{css,js,json,scss,ts,tsx}` `git ls-files --modified ./**/*.{css,js,json,scss,ts,tsx}`",
     "format-full": "prettier --list-different --write \"*.{css,js,json,scss,ts,tsx}\" \"./**/*.{css,js,json,scss,ts,tsx}\"",
-    "transpile": "tsc",
+    "transpile": "tsc --incremental",
     "clean-transpile": "rimraf ts/**/*.js && rimraf ts/*.js",
     "pow-metrics": "node metrics_app.js localhost 9000",
     "ready": "yarn clean-transpile && yarn grunt && yarn lint-full && yarn test-node && yarn test-electron && yarn lint-deps"