Meihua fetcher pipeline to
- support getting all ad for different types for all keywords
- support generating create table / insert record SQL.
- support load from / write back to mysql db
Merge branch 'review' of https://github.com/happyili/fdd_pipeline into review
Merge pull request #10 from happyili/review

Review the meihua pipeline for crawl all keyword all ad type and write back to db