reimplemented gsub(copied a lot from rubinious) and wrote tests for our implementation. gsub now supports blocks and hashes
resetted ruby.h to its old version
Merge branch 'master-1.9' of github.com:MagLev/maglev into kirstin/reimplemented_gsub
fix rubyspecs
remove specs that now pass
Merge pull request #264 from MagLev/kirstin/reimplemented_gsub

reimplemented gsub(copied a lot from rubinius) and wrote tests for our ...