Switch to ssh-credentials and the credentials-plugin store. [FIXES JENKINS-6714] correctly, i.e. keyboard-interactive now works
Merge pull request #6 from stephenc/master

Integrate with ssh-credentials-plugin and credentials-plugin
add .idea to .gitignore
Oops! forgot to commit these changes
Move the credentials from the advanced box to outside it

* the credentials to connect with are not an advanced setting, everything else is a tweak though
Add a link to the manage credentials screen.

* Not using target="_" as we have no way to trigger this screen to reload the list of credentials, so the user is going to have to reload this screen anyway
Add Chinese (traditional) translation.