Add module with support for (patched) Trilead SSH2 (SVNKit fork)

This is, perhaps, more a request for comments than a patch submitted as ready for merge. That said, it _has_ been tested end-to-end against the version of Trilead SSH2 at http://svn.svnkit.com/repos/3rdparty/com.trilead.ssh2/trunk/ with the patch given in the diff applied.

Is there interest in merging this? If so, what work would be required to make it acceptable?