Please merge new railsexpress patchsets

Hi,

I have discovered a memory leak in the falcon sparse-array patch.

We went live with 1.9.3-p392 yesterday and had to roll back because we were leaking memory like crazy.

This updated railsexpress patchset fixes the problem.

Can you please merge and release a new rvm version?

It seems quite a few people are affected by the problem.

See https://gist.github.com/funny-falcon/4136373