del unused method
fix bug: 
1. uri with blank will return 400
2. ns unicode search bug
fix bug:as query min/max value
fix bug:
1、 multiple nameserver IP addresses format,every ip as an string item
2、Large AS numbers make the server crash
3、"400" errorCode format change to 400
4、"events" value should be an array of events
5、Domain objects contain a "nameServer" JSON value,change to
'nnameServers'
6、IDN nameservers query bug,eg :/nameserver/ns2.eé28.cn
7、Missing support for IDN nameservers
8、idn search bug: /domains?name=xn--* should return 200
9、Missing search for nameservers by IP address
10、Empty properties in JSON responses,Empty values should not be
returned
11、Incorrect validation of AS number queries,eg  /autnum/%20xxxx should
return 400
12、Incorrect validation of internationalized domain names (IDN)