Add reproducible example of an option not passed on

[fboeller]

This PR reproduces the issue #37 .

1. Build and run password-protected redis container: ./test/open-with-password/start-redis-container.sh.
2. Run node ./test/open-with-password/open-with-password.js.

The second command fails with the current version of redisdown.
If the _makeRedisId function is adjusted (adding "password" to the array or merging the options with the to be added options for example), then it successfully opens and closes.

[seigel]

Thank you. That gives me and Idea of what you are seeing. I'm just fighting with some tests right now and will hopefully get something together when I understand what I am forgetting :)