New 'screenshot' option when launching a test

lib/server/datastores/runsQueue.js

@@ -1,4 +1,5 @@
 var Q = require('q');
+var debug = require('debug')('ylt:runsQueue');
 
 
 function RunsQueue() {
@@ -11,6 +12,8 @@ function RunsQueue() {
         var deferred = Q.defer();
         var startingPosition = queue.length;
 
+        debug('Adding run %s to the queue, position is %d', runId, startingPosition);
+
         if (startingPosition === 0) {
             
             // The queue is empty, let's run immediatly