1. add comments to all api calls

2. add bCommit parameter to delete api on BitcasaFileSystemApi.java; if bCommit is true, then Bitcasa will permanently delete this item, otherwise, this item will move to the trash.
3. bug fixed for item.listHistory
4. bug fixed on ListSingleFileVersion
5. add actionhistory details and api request
6. add CreateTestUserAccount api
7. bugs fixed on listShare, receiveShare, and browseShare
8. add sample app MyStorage; MyStorage gives basic demo of how to authorized through Bitcasa Cloudfs, upload a file to file system, download first file from Bitcasa file system!