Remove ssl:remove entirely. ssl:clear can be used instead.
Deprecate ssl:add.
Document everything in ssl namespace as 'legacy'.
Remove ssl_spec entirely since it was only testing ssl:remove, which is gone, and ssl:add, which doesn't do anything anymore.
ssl:add deprecation: update formatting to be more in line with pre-existing stuff
Mark the entire ssl module as deprecated so it's not listed in `heroku help`
Merge pull request #719 from kch/ssl-add-deprecation

deprecate `ssl` namespace commands, cripple ssl:add entirely