add sleep to decrease cpu usage while waiting for response #51
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before:
$
time webkit2png --xvfb 1024 1024 -g 1024 1024 --scale 200 200 --aspect-ratio=keep --timeout=30 --log='' -o /tmp/img.png http://long-sitereal 0m10.553s
user 0m8.383s
sys 0m2.092s
after:
$
time webkit2png --xvfb 1024 1024 -g 1024 1024 --scale 200 200 --aspect-ratio=keep --timeout=30 --log='' -o /tmp/img.png http://long-sitereal 0m11.074s
user 0m0.412s
sys 0m0.078s