Moved from adobe/wskdebug#39

In non-verbose mode there are sometimes longer pauses (e.g. installing a bigger action on the container) where it's unclear to the user if wskdebug is ready or still working. A spinner style output would be much nicer.

Candidates:

• https://github.com/sindresorhus/ora
• https://github.com/sindresorhus/cli-spinners