Changelog

version 0.6.1

GH-20: In case of publickey authentication using a string rather than a file, prevent private key data from leaking in logs / on authentication exception.
GH-21: SessionChannel#changeWindowDimensions was broken
Prevent occasional spurious NPE when disconnecting at AbstractDirectChannel#notifyError.
SSHClient implements Closeable.
GH-22: OSGi-fication

DisconnectListener callback.
FileTransfer interface refactored. Local source and destination paths can be any implementation of LocalSourceFile and LocalDestFile, respectively.
Bug in case of SCP remote path having spaces fixed.
Deprecated Command#getOutputAsString() and Command#getErrorAsString() -- recommend using IOUtils#pipeStream(..) instead.
StreamCopier interface updated, now uses builder pattern. start() to spawn, copy() to do it in current thread and block.
Possible to specify an alternate path separator (for Windows SFTP servers).
Several internal refactorings that make the library nicer...

stderr ChannelInputStream gets correctly notified of errors e.g. at the transport layer.
Added a channel.join(timeout) variant.
An alternate AndroidConfig to initialize SSHClient with on Android 2.3+ was added, which uses JCERandom instead of BouncyCastleRandom.
In SCP upload, detect when destination directory does not exist. This was previously detected as a warning (well, technically it is sent as one...) but should truly be an error. All SCP 'warnings' now treated as errors.
Bug with StatefulSFTPClient#put fixed - was doing a get instead of a put!
SessionChannel reuse now gets an explicit runtime error.

channel.close() method no longer called implicitly on disconnecting, because this is error prone. See updated examples.
Logging fix: enable filtering, previously due to misconfiguration this was hard to do.
Don't barf when a server sends more CHANNEL_DATA than announced. Now there is no exception in this case, but still only as much data as announced is consumed.
Client was still identifying as SSHJ_0_1 -- changed to SSHJ_0_3.
Support for SFTP versions less than 3.
Host based authentication - see net.schmizz.sshj.userauth.method.AuthHostbased; pass an instance to SSHClient.auth() to use.
Added Channel.join() to allow blocking on channel close event. Useful e.g. when waiting for a command to exit.
Various code cleanups.

In 0.2.0 DefaultModeGetter and DeaultModeSetter started throwing exception when permissions couldn't be retrieved/assigned, and this was problematic on windows so the exception has been replaced with a log message.

Now compiled with compiler source and target level = 6 -- JRE 6+ is required! Always was, just more explicit now.
New methods in SFTPClient: checking if a file/directory exists (statExistence() -- returns null on file not found); recursively create directories (mkdirs()).
Bug with SFTP directory listing being truncated fixed.
Timestamps and permissions are now preserved by default when transferring with SCP or SFTP. A bug which prevented even using the ModeGetter or ModeSetter interface for this purpose has been quashed.
keyboard-interactive authentication now supported. SSHClient#authPassword() attempts to use it as a fallback by default.
An interface has been introduced for observing progress of file transfers (TransferListener) which can be registered with any FileTransfer implementation (i.e. SCPFileTransfer; SFTPFileTransfer).
Various bugfixes and improvements.