[core] Merge pull request rspec/rspec-core#382 from jscheid/master

Convert value returned by DRb to integer

---
This commit was imported from rspec/rspec-core@c4427b7.

rspec-core/lib/rspec/core/runner.rb

@@ -8,7 +8,7 @@ class Runner
       def self.autorun
         return if autorun_disabled? || installed_at_exit? || running_in_drb?
         @installed_at_exit = true
-        at_exit { exit(run(ARGV, $stderr, $stdout)) }
+        at_exit { exit(run(ARGV, $stderr, $stdout).to_i) }
       end
       AT_EXIT_HOOK_BACKTRACE_LINE = "#{__FILE__}:#{__LINE__ - 2}:in `autorun'"