clarify output of deploy command

[mykmelez]

The deploy command's output could be clearer. Here's an example of the current design:

[16:21:44] Deploying "ignore cache created when using oghliner CLI"
[16:21:44] Cloning git@github.com:mykmelez/eggtimer.git into .gh-pages-cache
[16:21:44] Cleaning
[16:21:44] Fetching origin
[16:21:45] Checking out origin/gh-pages
[16:21:45] Removing files
[16:21:45] Copying files
[16:21:45] Adding all
[16:21:45] Committing
[16:21:45] Pushing

As with #162, this is basically fine, modulo unnecessary timestamps. Perhaps we'd want to add an ellipsis (…) to the end of each step, then prepend a green checkmark and append the word "done!" after the step is complete, like for configure in #148.

I'd also update the header line to look like:

Deploying "ignore cache created when using oghliner CLI" to GitHub Pages…

And if the commit message is multi-line, I'd ensure that only the first line appears in that header line.

As with #162, this command runs frequently and often is automated as part of a build process, so we should avoid extraneous header/footer information.

[marco-c]

#172 is removing the timestamps.