Feature/introduction troubleshooting

![2014-10-31_1920x1080](https://cloud.githubusercontent.com/assets/1506905/4854661/e64b8138-6096-11e4-9b2a-0eb76ab5ed4f.png)
When trying to check out issue from nodeschool/discussions I entered wrong filename & got the standard ###YOUR SOLUTION IS NOT CORRECT### from https://github.com/substack/adventure/blob/d6f9d53e925f3cddcfda4d36efecf0081837a5ab/index.js#L221-L228

Offer this sample troubleshotting for introduction problem.
Also took liberty of modifying arrays/index.js#verify to not throw exception if no result was passed in
Added troubleshoot & some initial message (see screenshot) to all the problems - people can contribute using github now.