Set the date of the release on the changelog

--HG--
branch : 1.1-stable
extra : source : 9cddbb9af9ebcae42c500ba0d4a7a9078aca2550
Update changelog

--HG--
branch : 1.1-stable
Set version to 1.1.1

--HG--
branch : 1.1-stable
Added tag 1.1.1 for changeset a5f574030b64

--HG--
branch : 1.1-stable