Tweak mail templates a bit, to reference config values

probably more needs to be done, this is at least a step..

rattail_tempmon/templates/mail/tempmon_critical_temp.html.mako

@@ -17,7 +17,7 @@
       Check out <a href="http://www.fsis.usda.gov/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/safe-food-handling/freezing-and-food-safety/CT_Index/!ut/p/a1/jZFRT8IwEIB_DY9dbw7J8G1ZYtiUTYJK2Qsp7NYt2dqlrU759RZ8UQJK-9LefV-ud6UFZbSQ_L0R3DZK8vZwLyYbWMDEn8aQ5lP_HpLsdZE_xDGEy1sHrP8AsuBK_8KK4D8_vaLAjZ7Hc0GLntuaNLJSlAm0hEszoDaUVUqVxPAK7Sep-M4SUyNalzjEyDFbc1m2jRQO1oh7d3J6SX6YlMXPm0SW-EFXtPj9KvDdTrJgOZ6lWQD5-BQ4M7Zv4PJcXOOiVdvjH60juQ1C16HGCjVq7027cG1tb-5GMIJhGDyhlGjR26nunFArYyk74fruhe0foxk0T90qNNEXiOIqAA!!/#16">this USDA link</a> for useful information
     </p>
     <p>
-      This email will repeat every 15 minutes until the issue<br>
+      This email will repeat every ${probe.status_alert_timeout} minutes until the issue<br>
       has been resolved.
     </p>
     <p>

rattail_tempmon/templates/mail/tempmon_error.html.mako

@@ -4,7 +4,7 @@
     <p>At ${taken or now}, ${probe} reported that its status was: ${status}.<br>
       Something went wrong. Please investigate as soon as possible.
     </p>
-    <p>This email will repeat every 15 minutes until the issue is resolved.
+    <p>This email will repeat every ${probe.status_alert_timeout} minutes until the issue is resolved.
     </p>
   </body>
 </html>

rattail_tempmon/templates/mail/tempmon_high_temp.html.mako

@@ -10,7 +10,7 @@
     </p>
     <p>
       Notes:<br>
-      This alert will happen every 15 minutes until<br>
+      This alert will happen every ${probe.status_alert_timeout} minutes until<br>
       the temperature reaches an acceptable level.<br>
     </p>
   </body>

rattail_tempmon/templates/mail/tempmon_low_temp.html.mako

@@ -10,7 +10,7 @@
     </p>
     <p>
       Notes:<br>
-      This alert will happen every 15 minutes until<br>
+      This alert will happen every ${probe.status_alert_timeout} minutes until<br>
       the temperature reaches an acceptable level.<br>
     </p>
   </body>