Use electron instead of electron-prebuilt.

Switch out karma-electron-launcher for karma-electron, which seems to be
more up to date and is just a drop in replacement.

Author: keokilee

package.json

@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/keokilee/react-electron-webview#readme",
   "peerDependencies": {
-    "electron-prebuilt": "^1.0.0",
+    "electron": "^1.0.0",
     "react": "^0.14.0 || ^15.0.0",
     "react-dom": "^0.14.0|| ^15.0.0"
   },
@@ -38,14 +38,15 @@
     "@types/react": "^0.14.47",
     "babel": "^6.3.26",
     "babel-cli": "^6.3.17",
+    "babel-core": "^6.18.2",
     "babel-loader": "^6.2.0",
     "babel-preset-es2015": "^6.3.13",
     "babel-preset-react": "^6.3.13",
     "babel-register": "^6.3.13",
-    "electron-prebuilt": "^1.4.6",
+    "electron": "^1.4.7",
     "expect": "^1.13.4",
     "karma": "^1.3.0",
-    "karma-electron-launcher": "^0.1.0",
+    "karma-electron": "^5.1.1",
     "karma-mocha": "^1.3.0",
     "karma-sourcemap-loader": "^0.3.6",
     "karma-spec-reporter": "0.0.26",