Merge pull request #60 from wangtuanjie/feature/add_batch_unit_test

Feature/add batch unit test
sdkspec v1.0.2
compile gist docs
CHANGELOG v5.0.0
Merge pull request #61 from xushiwei/feature/new-dntoken

sdkspec v1.0.2
get privateUrl test
etag
Merge pull request #63 from xushiwei/feature/new-dntoken

get privateUrl test
accessKey/secretKey
Merge pull request #65 from xushiwei/feature/new-dntoken

accessKey/secretKey
Merge remote-tracking branch 'qiniu/develop' into develop