modman is cool, but --force should be warning

[hellomaya]

I have tried modman, and it's really cool, thanks for your good work.

In one of my mistakes, I used the same path name with core frontend template folder and files, when I run modman deploy-all --force, the core frontend template folder is deleted too, well I think we should put some warning message on tutorials or README, that could be a rookie mistake and a disaster...

Thanks.

[colinmollenhour]

I think it should be a given that you should not use the --force lightly. E.g. I would hope you don't git push --force out of habit too or you're just asking for more pain.