Add mina ssh to dependencies
Add SSH Service Listener
refs #115: Support git access via ssh (1st step)

EXPERIMENTAL

TODOs

* Authentication (PublicKey)
* Publickey management in profile view
* Commit hooks integration (WebHook too)
* Parse command correctly
* Make Configurable many options(enable/disable, port, etc...)
* ShellProcessFactory
* Test, test, test...
(refs #115) Reorganize ssh sources
(refs #115) Add PublicKeyAuthenticator sample impl

Auth TODOs

* Fetch user account pubkeys from DB
(refs #110) Add CommitHook sample

WIP: Some important functions are not implement yet.
(refs #110)Update apache sshd version

For fix authentication partial bug
(refs #110)Correct authentication and CommitHook
(refs #115)Ensure exit status 1 on GitCommand error
(refs #330)Return NotFound if specified file does not exist
Remove unnecessary code
(refs #292) Fix to limit issue result before joins issue labels.
Remove unnecessary import.
(refs #299)Fix redirection path in PullRequestsController
Replace Context#path with the base url if it's configured.
Fix error when base url is configured.
Update README.md for 1.11.1 release
Merge branches 'master' and 'ssh-access' of https://github.com/takezoe/gitbucket