Test

New branch test was a new version of utils4scrapy which has been improved based on the old version.But it's still on the test stage.Points different from the old simply are the follows:
1.debug some little problems in the old version,such as redis data flushed in running time
2.delete some complex functions,simplify the redis operation,now redis just stores tokens and count persuming that tokens never expire.
3.adjust file structure,some .py files have been deprecated.