Hi, I have completed adding putBlobAsync method. I have done all the changes specified by the community. Here it the pull request for that.
https://github.com/SpandanThakur/jclouds/pull/2 Some community members suggested having new interface for asynchronous calls. I have done it as a separate pull request. https://github.com/SpandanThakur/jclouds/pull/4 Please let me know your comments and next steps to take it to master branch