sshflash - last release using SSH keys

This is the last release that uses SSH keys to authenticate to the leapster.

There is a corresponding change in retroleap to remove the use of these keys and use open authentication instead.

tl;dr - for any retroleap version up to and including v2.0.0-alpha4, you need to use this version of sshflash.

For versions newer than v2.0.0-alpha4, you should use the latest version of sshflash.