postgres support

Gemfile

@@ -6,6 +6,8 @@ ruby '2.3.1'
 gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
+# Use postgres as the database for Active Record
+gem 'pg'
 # Use Puma as the app server
 gem 'puma', '~> 3.0'
 # Use SCSS for stylesheets

Gemfile.lock

@@ -131,6 +131,7 @@ GEM
     omniauth-twitter (1.2.1)
       json (~> 1.3)
       omniauth-oauth (~> 1.1)
+    pg (0.19.0)
     puma (3.6.0)
     rack (2.0.1)
     rack-test (0.6.3)
@@ -225,6 +226,7 @@ DEPENDENCIES
   omniauth (= 1.3.1)
   omniauth-google-oauth2 (= 0.4.1)
   omniauth-twitter (= 1.2.1)
+  pg
   puma (~> 3.0)
   rails (~> 5.0.0, >= 5.0.0.1)
   rails-timeago (~> 2.0)

config/database.yml

@@ -21,5 +21,10 @@ test:
   database: db/test.sqlite3
 
 production:
-  <<: *default
-  database: db/production/production.sqlite3
+  adapter: <%= ENV['DB_ADAPTER'] || 'sqlite3' %>
+  host: <%= ENV['DB_HOST'] %>
+  database: <%= ENV['DB_NAME'] || 'db/production/production.sqlite3' %>
+  username: <%= ENV['DB_USERNAME'] %>
+  password: <%= ENV['DB_PASSWORD'] %>
+  pool: <%= ENV['DB_POOL'] || 5 %>
+  timeout: <%= ENV['DB_TIMEOUT'] || 5000 %>

env

@@ -47,7 +47,7 @@ SMTP_PASSWORD=yourpassword
 # Twitter Login Provider (optional)
 #
 #   You will need to register the app at https://apps.twitter.com/
-#   For the callback URL use 'http://<your hostname:port>/users/auth/twitter/callback'
+#   For the callback URL use 'http://<your hostname:port>/auth/twitter/callback'
 #   Once registered copy the ID and Secret here
 #
 TWITTER_ID=
@@ -57,7 +57,7 @@ TWITTER_SECRET=
 #
 #   You will need to register for at https://console.developers.google.com/apis/credentials
 #   Select Oauth client ID -> web application
-#   For the callback URL use 'http://<your hostname:port>/users/auth/google/callback'
+#   For the callback URL use 'http://<your hostname:port>/auth/google/callback'
 #   Once registered copy the ID and Secret here
 #
 GOOGLE_OAUTH2_ID=