allow snapshots to be disabled easily

lib/common.php

@@ -158,7 +158,8 @@ $config =
         array('subscribe' => null,
               'welcome' => null),
         'snapshot' =>
-        array('run' => 'web',
+        array('enabled' => true,
+              'run' => 'web',
               'frequency' => 10000,
               'reporturl' => 'http://laconi.ca/stats/report'),
         );

lib/snapshot.php

@@ -73,6 +73,10 @@ class Snapshot
 
     static function check()
     {
+        if (!common_config('snapshot', 'enabled')) {
+            return;
+        }
+
         switch (common_config('snapshot', 'run')) {
         case 'web':
             // skip if we're not running on the Web.