refactoring

- move the jest configuration files to the root directory
- remove squirrel installer startup check
- increase coverage for protocol handler
- update package.json as per the above

tests/spectron/jest_spectron.json

@@ -1,7 +0,0 @@
-{
-  "verbose": true,
-  "testMatch": [
-    "**/*.spectron.js"
-  ],
-  "testResultsProcessor": "../../node_modules/jest-html-reporter" 
-}