Add #import tests

I added import.sss in /samples/ 

With the current set-up in import.rb, `@path` was returning a string with leading and trailing `'`s, so I added the `chomp`s to make `@path` a quoteless string.

One issue with this file is the `expand_path` -- right now it's set so that only files within `/samples` can be used/imported, which obviously isn't good but this is the current workaround. `SSS::BASE_DIR` was erroring out for me, which is why I made this little change. I'll hack a bit more to at least make it such that importing requires the two files to be in the same directory.