Revert "Ruby 1.8.7 cant work with dependencies introduced by simplecov-0.8.2"

This reverts commit 1d0f7af57182bbdda2ac47115b050182790111a1.
Revert "update simplecov"

This reverts commit d7f9f2ccadfe095a6e3723fdf1cb5d31b0c2e109.