mysql batch update error log
Merge pull request #37 from fangdiantong/yesenfei

mysql batch update error log
Merge pull request #38 from fangdiantong/yiling

Refactor and add all the data converters. (region/dsp)
add the baidusem keyword_type column
revert the keyword_type change
Merge pull request #39 from fangdiantong/yesenfei

add the baidusem keyword_type column
Merge pull request #40 from fangdiantong/yiling

Move common ads fields (keyword and campaign type) to common logic。
Refactor and move all common methods to Base/Util class.
Rename MongoRowConverter to AdDataConverter.
Add several interface for MongoRowConverter: get campaign / region / device