update changelog with recent work on dev branch

ChangeLog

 train-2011.08.18:
-  * upon clickthrough of the email link, don't have the browser window close itself: issue #162
-  * passwords must be between 8 and 80 chars: issue #155
-  * improved handling of emailing & verification urls during local development & testing: issue #88
+  * upon clickthrough of the email link, don't have the browser window close itself: #162
+  * passwords must be between 8 and 80 chars: #155
+  * improved handling of emailing & verification urls during local development & testing: #88
+  * language changes in dialog: #150
+  * many improvements to unit tests: #171
+  * forgotten password flow was broken with port to mysql, fixed: #170
+  * improved metrics reporting abstraction: #168
+  * moved all server logging into a single file: #169
+  * all files created at execution time are now in one location:  #172	
+  * developer ergonomics - improved colorized logging with terse webserver output to console
+  * always require a user to authenticate if they don't have an active session: #74
 	
 train-2011.08.12:
   * massive zero-user-visibile refactoring of dialog javascript.