Pass arguments to `tail`

https://devcenter.heroku.com/articles/logging

If you have multiple dynos and/or dyno types
and want to filter log tailing to the process or dyno type,
you pass those filters on with the `--source` or `--ps` arguments.

This commit adds argument passthrough to the `tail` command.

Also:

* Convert single-quotes to double-quotes for affected files.