IMPORTANT - removed all sample files

This is very likely to cause merge conflict, it is for the greater good
Discuss at: http://meta.discourse.org/t/enough-with-the-sample-files/10351

From now on we use ENV to customise if needed

config/database.yml

@@ -0,0 +1,51 @@
+development:
+  adapter: postgresql
+  database: discourse_development
+  min_messages: warning
+  host: localhost
+  pool: 5
+  timeout: 5000
+  host_names:
+    ### Don't include the port number here. Change the "port" site setting instead, at /admin/site_settings.
+    ### If you change this setting you will need to
+    ###   - restart sidekiq if you change this setting
+    ###   - rebake all to posts using: `RAILS_ENV=production bundle exec rake posts:rebake`
+    - "localhost"
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  adapter: postgresql
+  database: discourse_test
+  min_messages: warning
+  host: localhost
+  pool: 5
+  timeout: 5000
+  host_names:
+    - test.localhost
+
+# profile db is used for benchamarking using the script/bench.rb script
+profile:
+  adapter: postgresql
+  database: discourse_profile
+  min_messages: warning
+  host: localhost
+  pool: 5
+  timeout: 5000
+  host_names:
+    - "localhost"
+
+production:
+  pool: <%= ENV['POSTGRES_CONNECTION_POOL'] || 5 %>
+  timeout: 5000
+  adapter: postgresql
+  uri: <%= uri = URI.parse(ENV['POSTGRES_URL']) %>
+  socket: <%= ENV['POSTGRES_SOCKET'] %>
+  host: <%= uri.host  %>
+  port: <%= uri.port || 5432 %>
+  database: <%= ENV['POSTGRES_DB'] %>
+  username: <%= uri.user %>
+  password: <%= uri.password %>
+  host_names:
+    - <%= ENV["DISCOURSE_HOSTNAME"] || raise "env var for DISCOURSE_HOSTNAME must be set" %> # Update this to be the domain of your production site