Added rubysl-rexml to Rubinius deps.
Merge pull request #12732 from razielgn/additional-rbx-dep

Added rubysl-rexml to Rubinius deps.
Passing args for gemfile entry

Fixing build
Merge pull request #12729 from arunagw/build-fixed-ruby193

Can't used named argument in ruby 1.9.3
More Warnings removed for ruby trunk

Same as 4d4ff531b8807ee88a3fc46875c7e76f613956fb
shadowing variable warning removed