remove Enumerable#each_with_object from core_ext as it is present in …
@josevalim Could you please take a look?
@lest there is no need to ping me twice. I receive e-mails and check all pull requests. :) Thanks again!
btw, should I mention somebody (e.g. who wrote code I've changed) in description of PR?
No. Everyone receives the pull request by default. :)