Use find command for unlink
Implement hermit-unlink
Fix hermit-unlink
Update hermit-unlink

I think I finished all the suggestions Geoff. Tell me if I missed anything! Also thanks for the tip on using test, it makes the code so much shorter!
Merge pull request #38 from houngj/master

Implement hermit-unlink
Create parent directories when linking

Fixes #52
Pull linking and dir creation out into a function
Quote protect all variables in link
Implement a basic version of force linking

It doesn't actually forcibly remove stuff, but it will prompt to remove
things. I consider this a good compromise between functionality and
safety.

Fixes #48.