clarify output of integrate command

[mykmelez]

The integrate command's output should be clearer. Here's an example of the current output:

[16:03:05] Your app needs to load the script offline-manager.js in order to register the service
worker that offlines your app. To load the script, add this line to your app's HTML
page(s)/template(s):

    <script src="offline-manager.js"></script>

Here's a proposed redesign:

Integrating Oghliner into the app in the current directory…

✓ Copying offline-manager.js to [TARGET DIRECTORY]… done!

Oghliner has been integrated into the app!

The app needs to load the script offline-manager.js in order to register
the service worker that offlines the app. To load the script, add this line
to the app's HTML page(s)/template(s):

<script src="offline-manager.js"></script>

And commit the changes and push the commit to the origin/master branch:

git commit -m"integrate Oghliner" --all
git push origin master

Then you can offline and deploy the app using the *offline* and *deploy* commands.

ℹ For more information about offlining and deployment, see:
    https://mozilla.github.io/oghliner/

As with #148 and #160, the checkmark is green, the information message (ℹ) is blue, and the Git command examples are bold gray. The HTML tag to copy/paste should also be bold gray. Unsure about indentation level for the HTML tag. Let's left-align for now and see how it feels.