Homebrew/homebrew — pull request #29243 by nykolaslima (2014-05-14 13:28:49+00:00)
Title: Hadoop core was renamed to Hadoop Commons

Hadoop core was renamed to Hadoop Commons as related in website: `July 2009 - New Hadoop Subprojects - Hadoop Core is renamed Hadoop Common.`

This breaks hadoop install from home brew, returning a 404 not found from mirrors.

This fix renames `core` to `commons` in `hadoop.rb`.