Add XXXAsync method to all Client class for async await pattern.
(HttpClient,BoxNetClient,DropboxClient,FacebookClient,FtpClient,RssClient,SugarSyncClient,TwitterClient,WindowsLiveClient)
Add all api to HigLabo.Net.Ftp project.
Add strong name to all assembly.

Add HttpBodyMultipartFormData to provide upload multipart form data with http protocol.
Add HttpBodyFormUrlEncodedData to provide form url encoded post data with http protocol.
FacebookClient,RssClient,WindowsLiveClient,BoxNetClient class inherit from HttpClient class.
Refactoring PutFileDataCommand of HigLabo.Net.SugarSync project.