Pass nil app_name to Resolver if app method throws
Fix ruby2.0 Hash[nil] deprecated warnings in pg.rb
When a member exists, it returns 302
Change role automatically if member already exists
heroku sharing:{add,remove} manager API fixes

- sharing:add uses "/collaborators"
- sharing:remove uses manager API when appropriate
stop running ci on 1.8.7

we dropped support to it long ago
Merge pull request #991 from heroku/org-sharing-add-remove-endpoint

heroku sharing:{add,remove} manager API fixes
Merge pull request #981 from ys/refactor/pg-params-compact

Fix ruby2.0 Hash[nil] deprecated warnings in pg.rb
Merge pull request #980 from deafbybeheading/fix-hpg_translate_db_opts_to_urls

Pass nil app_name to Resolver if app method throws
Merge pull request #990 from heroku/add-302-when-members-add

When a member exists, it returns 302
v3.2.2