SSH.NET 2014.4.6-beta1

New Features: * Added callbacks to UploadFile, DownloadFile and ListDirectory in SftpClient (issue #1324) * Allow a given private key file to be used concurrently * Performance improvements: - optimization of payload size for both read and write operations (SftpClient only) - increase window size from 1MB to 2MB - increase buffer size from 16KB to 64KB for SftpClient - take into account the maximum remote packet size of the channel for write operations - increase maximum size of packets that we can receive from 32 KB to 64 KB * Improve exception message for authentication failures Breaking changes: * Assembly name is now Renci.SshNet for all supported frameworks * The Renci.SshNet assemblies for .NET and Silverlight are now strong-named (issue #1802) Fixes: * Remove linefeed from WriteLine method in Shellstream class (issue #1584) * Disable logging of messages in release builds (issue #1767) * Stuck loop on key exchange using arcfour encryption (issue #1922) * Timeout sending data to server with low window size (issue #1706) * No connection possible with the same auth method requested multiple times (issue #1930) * Unobserved exception rethrown by finalizer thread (issue #1298 and #1587) * Client cipher is used to decrypt server messages (issue #1917) * Connection dropped by server due to invalid DSA signature (issue #1918) * Correct casing of Security/Cryptography/HMAC.cs to fix build on Linux (issue #1505) * HTTP proxy hangs (issue #1890) * Wrong parameters to SetSocketOption leads to SocketException under Mono (issue #1799) * Incorrect check for timeout values (issue #1620) * Wrong PKCS7 padding in DES algorithm (issue #1580) * OverflowException on empty server response (issue #1562) * Event handle leak (issue #1761) * SftpFileStream is very slow (issue #1919) * Write access required for private key file