Make `cci gist` title include date/time when log was made

[TheBitShepherd]

The title of gists currently includes datetime.utcnow(); however, this occurs upon the creation of the GitHub gist, not when the command associated with the contents of the gist was run.

It would be good to have datetime values of when commands were run to help with troubleshooting issues.

[davisagli]

@Br4nd0R can we just use the creation date of the logfile?

[TheBitShepherd]

That's what I was thinking would be easiest to use for a close approximation.