Use puma instead of thin

Puma has become the default and has some really nice integration points
in Rails.

Co-Authored-By: Dan Rice <dnrce@users.noreply.github.com>

Gemfile

@@ -33,7 +33,7 @@ gem "aasm", '~> 3.4.0'
 gem "htmlentities"
 gem "swf_fu"
 gem "rails_autolink"
-gem 'thin'
+gem 'puma', '~> 3.0'
 gem 'paperclip'
 
 # To use ActiveModel has_secure_password

Gemfile.lock

@@ -76,12 +76,10 @@ GEM
     coffee-script-source (1.12.2)
     concurrent-ruby (1.0.5)
     crass (1.0.4)
-    daemons (1.2.6)
     database_cleaner (1.7.0)
     diff-lcs (1.3)
     docile (1.3.1)
     erubis (2.7.0)
-    eventmachine (1.2.7)
     execjs (2.7.0)
     factory_bot (4.10.0)
       activesupport (>= 3.0.0)
@@ -138,6 +136,7 @@ GEM
     parser (2.5.1.2)
       ast (~> 2.4.0)
     powerpack (0.1.2)
+    puma (3.12.0)
     rack (2.0.5)
     rack-dev-mark (0.7.7)
       rack (>= 1.1, < 2.1)
@@ -237,10 +236,6 @@ GEM
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
-    thin (1.7.2)
-      daemons (~> 1.0, >= 1.0.9)
-      eventmachine (~> 1.0, >= 1.0.4)
-      rack (>= 1, < 3)
     thor (0.20.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
@@ -285,6 +280,7 @@ DEPENDENCIES
   mocha
   mysql2 (~> 0.3.17)
   paperclip
+  puma (~> 3.0)
   rack-dev-mark
   rack-mini-profiler
   rails (~> 5.0.0)
@@ -301,7 +297,6 @@ DEPENDENCIES
   sqlite3
   swf_fu
   therubyracer
-  thin
   tolk (~> 2.0.0)
   uglifier (>= 1.3.0)
   will_paginate