Add full version string

Currently we only provide the version from `package.json`. This means
that during updates of instances, e.g. the demo instance, which runs
latest master instead of a stable release, changes are not reflected to
the webclient.

This patch adds a fullversion string that contains the current commit
and this way makes that clients are notified about changes.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/realtime.js

@@ -887,7 +887,7 @@ function connection (socket) {
   // check version
   socket.on('version', function () {
     socket.emit('version', {
-      version: config.version,
+      version: config.fullversion,
       minimumCompatibleVersion: config.minimumCompatibleVersion
     })
   })