Tornado 默认使用json，但是它太慢了，我想用ujson 来代替。
在应用的入口多加下面的代码即可：
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import sys
try:
sys.modules['json'] = __import__('ujson')
except ImportError:
pass
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>>> import sys
>>> sys.modules['json'] = __import__('ujson')
>>> sys.modules['json']
<module 'ujson' from '/usr/local/lib/python2.7/dist-packages/ujson.so'>
>>> import json as a
>>> import ujson as b
>>> a == b
True
>>> a is b
True
>>> a
<module 'ujson' from '/usr/local/lib/python2.7/dist-packages/ujson.so'>
>>> b
<module 'ujson' from '/usr/local/lib/python2.7/dist-packages/ujson.so'>
>>>