Explicitly require haml and sass to prevent tilt warning

    WARN: tilt autoloading 'haml' in a non thread-safe way; explicit
    require 'haml' suggested.

    WARN: tilt autoloading 'sass' in a non thread-safe way; explicit
    require 'sass' suggested.
Show open and closed milestones on the Release Board

We were previously only showing Next and Next+1 open milestones
along with two closed milestones.
If we create a release early (not as we're deploying)
we need to still see it on the Release Board.
Show the milestone state (open, closed) on the Release Board