chore(build): create a better 'watch' npm script

package.json

@@ -3,10 +3,13 @@
   "description": "UI-Router Core: Framework agnostic, State-based routing for JavaScript Single Page Apps",
   "version": "1.0.1",
   "scripts": {
-    "test": "karma start karma.conf.js",
-    "debug": "karma start karma.conf.js --singleRun=false --browsers=Chrome --autoWatch=true --autoWatchInterval=1",
     "clean": "shx rm -rf lib lib-esm",
     "build": "npm run clean && tsc && tsc -p tsconfig.esm.json",
+    "test": "karma start",
+    "watch": "run-p watch:*",
+    "watch:buildjs": "tsc -w",
+    "watch:test": "karma start --singleRun=false --autoWatch=true --autoWatchInterval=1",
+    "debug": "karma start --singleRun=false --autoWatch=true --autoWatchInterval=1 --browsers=Chrome",
     "prepublish": "npm run build"
   },
   "homepage": "https://ui-router.github.io",
@@ -62,6 +65,7 @@
     "karma-phantomjs-launcher": "^1.0.2",
     "karma-script-launcher": "~0.1.0",
     "karma-systemjs": "^0.7.2",
+    "npm-run-all": "^3.1.1",
     "readline-sync": "^1.4.4",
     "shelljs": "^0.7.0",
     "shx": "^0.1.4",