document changes in train-2012.04.11

ChangeLog

-train-2012.04.11 (in progress):
-  *
+train-2012.04.11:
+  * New BrowserID "Observer" API implemented in experimental status: #912
+  * Implement variable length sessions and explicit user confirmation to improve saftey on public terminals/shared computers: #884
+  * keysize is now 1024: #1293
+  * fix case where removing the same email address twice could cancel your account: #1123
+  * give user feedback after typing in email while we're checking the email provider for BrowserID support: #1290
+  * optimize javascript resources: #1351
+  * frontend tests only output failures: #1326
+  * documentation fixes: #1367, #1401
+  * logging improvements: #1327
+  * improve experience for users with cookies disabled: #1402, #1201, #1202, #1414
+  * use http status codes in verifier where appropriate: #1362
+  * improve password update in account manager screen: #1388, #1389
+  * developers link now points to MDN: #1397
+  * fix issues that were introduced while implementing the above features: #1349, #1348, #1354, #1357, #1374, #1399, #1400, #1408, #1395, #1406, #1405, #1390, #1391
 
 train-2012.03.28:
   * work towards better user messaging for when cookies are disabled: #1167, #1302