* lib/timeout.rb (ExitException): removed internal exception class
and use Timeout::Error instead, as using throw/catch to isolate
each timeouts now. [ruby-dev:49179] [Bug #11344]
* lib/timeout.rb (ExitException): leave Timeout::ExitException as an
alias of Timeout::Error for backward compatibility in stable branch.
[ruby-dev:49179] [Bug #11344]
merge revision(s) 51213: [Backport #11344]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@51523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e