Get a file to an InputStream and to put a file from an OutputStream

Migrating form Jcsh to SSHJ, I do not want to write a temporary file,
I need to get a file to an InputStream and to put a file from an OutputStream.

Will it be possible a lot easier to migrate if you can add these two functions in the SSHJ library like:
```
try (SFTPClient sftp = ssh.newSFTPClient())
{
InputStream inputStream = sftp.get(pathRead);
sftp.put(outpuStream, pathWrite);
}
```