Add release notes for 0.9.3
(cherry picked from commit 6347d36c92f34c1f7fc1278347138c61d2e72649)
scripts: Add R16B01 and R16B02 to travis.yml config
scripts: Fix Travis-CI

They only support R16B

http://about.travis-ci.org/docs/user/languages/erlang/
scripts: Also test release-0.9.x on Travis-CI
mod_admin: Remove warning in m_admin_blocks