rspec-core-2.6.1 is released!

rspec-core-2.6.1 is released!

This is a bug fix release, restoring integration with with rcov.

full changelog: http://github.com/rspec/rspec-core/compare/v2.6.0...v2.6.1

* Bug fixes
  * Don't extend nil when filters are nil
  * `require 'rspec/autorun'` when running rcov.