add puma

Gemfile

@@ -53,6 +53,7 @@ gem 'sinatra', :require => nil
 gem 'devise-bootstrap-views'
 
 gem 'rails_12factor'
+gem 'puma'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

Gemfile.lock

@@ -151,6 +151,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    puma (2.12.2)
     rack (1.6.4)
     rack-cors (0.4.0)
     rack-protection (1.5.3)
@@ -296,6 +297,7 @@ DEPENDENCIES
   kaminari (~> 0.16.3)
   pg
   pry
+  puma
   rack-cors
   rails (= 4.2.3)
   rails_12factor

Procfile

@@ -0,0 +1 @@
+web: bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-development}