Encoding fix for worker pids on Windows.
Encoding fix for worker pids on Windows.

tasklist returns Shift_JIS in Ruby 1.9.

resque/resque,stvp/resque,ejlangev/resque,CloudVLab/resque,Shopify/resque,coupa/resque,CloudVLab/resque,coupa/resque,resque/resque,Shopify/resque,xiangzhuyuan/resque,resque/resque,CloudVLab/resque,xiangzhuyuan/resque,coupa/resque,Shopify/resque,stvp/resque,ejlangev/resque,xiangzhuyuan/resque,stvp/resque