Allow private key to be passed as a string

[EdwinHoksberg]

No description provided.

[rickmills]

Any chance this could get merged @DivineOmega ?

[pDonatas]

As this repo is abandoned, I've created a fork and added your changes feel free to download it https://github.com/pDonatas/php-ssh-connection

[sandeshjangam]

Feel free to use this new package: https://github.com/sandeshjangam/tiny-ssh-php.

• Support for multiple commands
• Get exit status
• Private key as a string support
• Updated to the latest version of phpseclib

I've rewritten the package to improve and address several issues, as the repo appeared to be abandoned.

This should offer better functionality and support for a wider range of use cases.