Merge pull request #238 from xshadow/CHANGELOG_for_1_29_0

added changelog.md with version tag and current changes

CHANGELOG.md

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+# 1.29.0
+
+**Goals**
+
+For this release we wanted to direct our effort towards improving user experience issues surrounding user accounts.
+
+**Update notes**
+
+This release features breaking changes to some clientside dependencies. Administrators must make sure to deploy the
+latest server with npm update before updating your clientside dependencies with bower update.
+
+**What's new**
+
+  * newly registered users are now able to delete their accounts automatically, along with any personal
+   information which had been created:
+    * ToDo list data is automatically deleted, along with user profiles
+    * all of a user's owned pads are also removed immediately in their account deletion process
+  * users who predate account deletion will not benefit from automatic account deletion, since the server
+    does not have sufficient knowledge to guarantee that the information they could request to have deleted is strictly
+    their own. For this reason, we've started working on scripts for validating user requests, so as to enable manual
+    deletion by the server administrator.
+    * the script can be found in cryptpad/check-account-deletion.js, and it will be a part of an ongoing
+      effort to improve administrator tooling for situations like this
+  * users who have not logged in, but wish to use their drive now see a ghost icon which they can use to create pads.
+    We hope this makes it easier to get started as a new user.
+  * registered users who have saved templates in their drives can now use those templates at any time, rather than only
+    using them to create new pads
+  * we've updated our file encryption code such that it does not interfere with other scripts which may be running at
+    the same time (synchronous blocking, for those who are interested)
+  * we now validate message signatures clientside, except when they are coming from the history keeper because clients
+    trust that the server has already validated those signatures
+
+**Bug fixes**
+  * we've removed some dependencies from our home page that were introduced when we updated to use bootstrap4
+  * we now import fontawesome as css, and not less, which saves processing time and saves room in our localStorage cache
+  * templates which do not have a 'type' attribute set are migrated such that the pads which are created with their
+    content are valid
+  * thumbnail creation for pads is now disabled by default, due to poor performance
+    * users can enable thumbnail creation in their settings page
+  * we've fixed a significant bug in how our server handles checkpoints (special patches in history which contain the
+    entire pads content)
+    * it was possible for two users to independently create checkpoints in close proximity while the document was in a
+      forked state. New users joining while the session was in this state would get stuck on one side of the fork,
+      and could lose data if the users on the opposing fork overrode their changes
+  * we've updated our tests, which have been failing for some time because their success conditions were no longer valid
+  * while trying to register a previously registered user, users could cancel the prompt to login as that user.
+    If they did so, the registration form remained locked. This has been fixed.