execute launching app and waiting results in parallel

This PR is basically same as the previous PR: https://github.com/apache/cordova-paramedic/pull/51#issuecomment-487122818

This PR is based on the current master branch.

Platforms affected

All platforms (tests only) Main target is Windows 10.

Motivation and Context

Fix #38 .

Without this PR, in runLocalTests following tasks are called in order.

launching test application
waiting application test results

However sometimes jasmine's tests in application are finished before the corodva-paramedic starts to wait the test results. I met this issue in Windows 10. (Please see #38)

Description

With this PR, the above two tasks are called in parallel. Then the cordova-paramedic can detect jasmine tests' results normally.

Testing

In my local PC (Windows 10),

npm run test-windows

(with Windows Loopback Exemption Manager as mentioned https://github.com/apache/cordova-paramedic#windows-quirks )

Checklist

[ ] I've run the tests to see all new and existing tests pass
[ ] I added automated test coverage as appropriate for this change
[ ] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
[ ] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
[ ] I've updated the documentation if necessary

apache / cordova-paramedic