Name of plugin install directory

I'm using google code to host a new rails plugin (http://
code.google.com/p/s3cachestore/).

My issue is that when someone installs my plugin (ruby script/plugin
install -x http://s3cachestore.googlecode.com/svn/trunk) - the
directory structure it
creates looks like:

svn/
- filename
- directory/

The problem is I don't what the structure to begin with "svn" I want
it to be:

s3cachestore
- filename
- directory/

My repository at google code looks simply:
- branches/
- tags/
- trunk/
----README
----init.rb
----lib/

How can I make it where it installs with "s3cachestore" as the parent
directory?

Thanks,

Steve
blog: http://niblets.wordpress.com
app: http://www.quizical.net