Commits on Jul 15, 2015

1. rm "at_exit" …

   at_exit seems to leak memory.
   
   checked with below script
   (copied from SamSaffron's
   rubyjs/therubyracer#336)
   
   ```
   require 'objspace'
   require 'memory_profiler'
   require 'fluent-logger'
   
   def rss
    `ps -eo pid,rss | grep #{Process.pid} | awk '{print $2}'`.to_i
   end
   
   MemoryProfiler::Helpers.full_gc
   puts "rss: #{rss} live objects #{GC.stat[:heap_live_slots]}"
   
   20.times do
     500.times { |i|
       Fluent::Logger::FluentLogger.new.post("tag", {"a"=>1})
     }
   
     MemoryProfiler::Helpers.full_gc
     puts "rss: #{rss} live objects #{GC.stat[:heap_live_slots]}"
   end
   ```
   
   before this patch
   
   ```
   rss: 19528 live objects 38181
   rss: 20836 live objects 46999
   rss: 21108 live objects 54998
   rss: 21948 live objects 62998
   rss: 22992 live objects 70998
   rss: 24192 live objects 78998
   rss: 25248 live objects 86998
   rss: 26324 live objects 94998
   rss: 27432 live objects 102998
   rss: 28556 live objects 110998
   ...
   ...
   
   ```
   
   after
   
   ```
   rss: 19840 live objects 38181
   rss: 20988 live objects 38998
   rss: 21048 live objects 38997
   rss: 21056 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   rss: 21116 live objects 38997
   ...
   ...
   ```

   ruseel committed Jul 15, 2015
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