* Rename --temp-directory option to --temp-dir
* Add -t alias

Deprecates the option name --temp-directory in favour of --temp-dir
--temp-directory has been demoted to a yargs alias of --temp-dir
This change makes the option naming consistent using the form --*-dir

Ask for link to repository first, add text explaining the importance of
linking a repository that demonstrates the bug.

This causes nyc to use final release of babel 7.