Should strip "教育频道_中国青年网" at end of the title

[evanxd]

Should strip "教育频道_中国青年网" at end of the title.
For example, 1

{
  "title": "海外留学生看两会：出国前后关注点大不同_教育频道_中国青年网"
}

And this is same issue as #366.