Merge pull request #1 from poiyzy/master

 OSS 10月17号更新，修改域名。
Add  option
can set mime type when putting
Merge pull request #2 from hayeah/master

Connection#put accepts options hash to change content type
ContentType bug fixed. version to 0.1.2;
1. 加入 delete 方法的调用接口;
2. 加入 Aliyun 接口的单独调用支持，以及测试方法;
Fix home page typo.
Custom domain support.
Make upload spec pass
  Add aliyun host config in spec helper
Update carrierwave version
  Make remove_file! method working, file should be deleted from aliyun and the database column should be cleared.
  1. Add specs
  2. Update carrierwave version