Add admin area view partials for each record type (#2700)

app/controllers/admin/domain_blocks_controller.rb

app/views/admin/accounts/_account.html.haml

app/views/admin/accounts/index.html.haml

app/views/admin/domain_blocks/_domain_block.html.haml

app/views/admin/domain_blocks/index.html.haml

app/views/admin/instances/_instance.html.haml

app/views/admin/instances/index.html.haml

app/views/admin/pubsubhubbub/_subscription.html.haml

app/views/admin/pubsubhubbub/index.html.haml

app/views/admin/reports/_report.html.haml

app/views/admin/reports/index.html.haml