sinatra/sinatra — pull request #643 by udzura (2013-02-25 08:31:06+00:00)
Title: Fix CALLERS_TO_IGNORE to ignore Rubygems 2.0.0 require definition file

This will fix #642...

> In rubygems 2.0.0, the file to override `Kernel#require` is `core_ext/kernel_require.rb` rather than `custom_require.rb`