sshd-core-0.5.1-r1095809.jar does not seem to exist publicly. Switching to an actual release.
Also allowing transitive dependencies to pick up MINA, since trying to use the previous version gives NSMEs (binary-incompatible signature change).
Merge pull request #40 from jglick/official-sshd

Updating SSHD
Merge pull request #39 from douglarek/master

Handle with change-abandoned and change-restored events