fix captcha
change index to read build file from client
Merge pull request #1411 from get/server-client-file

change index to read build file from client
style
Merge pull request #1399 from lzyzsd/master

fix captcha in comment
package: bump `engine.io`
Removed zuul yml
Merge branch 'master' of https://github.com/LearnBoost/socket.io into upstream