Doesn't handle show-paren-mode

[dabrahams]

When editing elisp with show-paren-mode active, I can't see the highlights it is supposed to add.
This version by Bozhidar Batsov, on the other hand, does handle it.
Your version is the one published by emacsmirror, though, thus I get it through el-get.
Some unification of improvements to zenburn would be nice!

[bbatsov]

Btw, my theme is available in the marmalade repository http://marmalade-repo.org/