Fixes #112 - Re-auth doesn't work if incorrect auth was provided initially.

https://github.com/billchurch/WebSSH2/issues/112

This commit send 'reauth' command to the client, when err.level === 'client-authentication'.

The client itself binds the 'reauthSession' function to that command, so it will automatically request authentication, every time the authentication fails.

The client bundle (webpack) is also rebuild with the made changes.

client/src/js/index.js

@@ -156,6 +156,8 @@ socket.on('error', function (err) {
   }
 })
 
+socket.on('reauth',reauthSession)
+
 term.on('title', function (title) {
   document.title = title
 })

server/socket.js

@@ -152,6 +152,8 @@ module.exports = function socket (socket) {
         console.log('WebSSH2 ' + 'error: Authentication failure'.red.bold +
           ' user=' + socket.request.session.username.yellow.bold.underline +
           ' from=' + socket.handshake.address.yellow.bold.underline)
+
+        socket.emit('reauth')
       } else {
         console.log('WebSSH2 Logout: user=' + socket.request.session.username + ' from=' + socket.handshake.address + ' host=' + socket.request.session.ssh.host + ' port=' + socket.request.session.ssh.port + ' sessionID=' + socket.request.sessionID + '/' + socket.id + ' allowreplay=' + socket.request.session.ssh.allowreplay + ' term=' + socket.request.session.ssh.term)
         if (err) {