Merge pull request #239 from forumbyr/master

fix bug:concurrent query count error
Merge pull request #241 from forumbyr/master

fix bug:concurrent query count error
fix bug:search xn--* should be valid; 
add NFKC to domain/ns query;
Merge pull request #242 from wade1012/dev

Dev Wade
Merge pull request #244 from forumbyr/master

fix bug:search xn--* should be valid;
Merge pull request #3 from cnnic/dev

Dev