Update CHANGESET.md

Summary of changes from commit log; mostly focussed on "hard" changes like the package updates (condensed to latest version numbers); questionable on the `LICENSE` file rename (probably of no interest to the reader, but I followed principle of gae-init file renames in previous `CHANGESET.md` entries; you can easily drop this bullet); what might be missing is a highlight of the new features. Note that I changed the release date of 0.9.0 to "tbd" (= to be determined).
Removed bullet about file rename (that of ), which is not that important
Removed gae-init-babel specific changes
First approach on deleting users
Merged
Minor fixes
Merge pull request #38 from mdxs/patch-1

Update CHANGESET.md
Added show_notifications() and clear_notifications() as JS functions
Added feedback notifications when deleting users
Minor fixes in coffee files
Fixed the disabled selection issue when cancel deletion
Removed label around selection and avatar in user_list.html
Replaced title of the accounts with an icon in user_list.html
Removed extra space
Added a clean up function for deletion and made it RESTier
Updated README.md with more contributors and minor changes