Trouble with sqlite3 in production...

Gemfile

@@ -19,8 +19,8 @@ gem 'therubyracer', platforms: :ruby
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails'
-# Turbolinks makes following links in your web application faster. Read more:
-# https://github.com/rails/turbolinks
+# Turbolinks makes following links in your web application
+# faster. Read more: https://github.com/rails/turbolinks
 gem 'turbolinks'
 gem 'jquery-turbolinks'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
@@ -94,13 +94,6 @@ gem 'meta-tags'
 gem 'twitter'
 
 group :development do
-  # Spring speeds up development by keeping your application running in the
-  # background. Read more: https://github.com/rails/spring
-  gem 'spring'
-  # Removed, because requires ruby > 2
-  # gem 'better_errors'
-  # gem 'binding_of_caller'
-
   gem 'sqlite3'
   gem 'guard-livereload'
   gem 'guard-migrate'
@@ -119,6 +112,19 @@ group :test do
   gem 'simplecov'
 end
 
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger
+  # console
+  gem 'byebug'
+
+  # Access an IRB console on exception pages or by using <%= console %> in views
+  gem 'web-console', '~> 2.0'
+
+  # Spring speeds up development by keeping your application running in the
+  # background. Read more: https://github.com/rails/spring
+  gem 'spring'
+end
+
 group :production do
   # Use mysql as the database for Active Record
   gem 'mysql2'

Gemfile.lock

@@ -81,6 +81,8 @@ GEM
     astrolabe (1.3.0)
       parser (>= 2.2.0.pre.3, < 3.0)
     bcrypt (3.1.10)
+    binding_of_caller (0.7.2)
+      debug_inspector (>= 0.0.1)
     bourbon (4.2.1)
       sass (~> 3.4)
       thor
@@ -96,6 +98,10 @@ GEM
       terminal-table (~> 1.4)
     buftok (0.2.0)
     builder (3.2.2)
+    byebug (3.5.1)
+      columnize (~> 0.8)
+      debugger-linecache (~> 1.2)
+      slop (~> 3.6)
     celluloid (0.16.0)
       timers (~> 4.0.0)
     chunky_png (1.3.4)
@@ -107,6 +113,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.1)
+    columnize (0.9.0)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -123,6 +130,8 @@ GEM
       compass (~> 1.0.0)
       sass-rails (<= 5.0.1)
       sprockets (< 2.13)
+    debug_inspector (0.0.2)
+    debugger-linecache (1.2.0)
     devise (3.4.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -408,6 +417,11 @@ GEM
       json (>= 1.8.0)
     warden (1.2.3)
       rack (>= 1.0)
+    web-console (2.1.0)
+      activemodel (>= 4.0)
+      binding_of_caller (>= 0.7.2)
+      railties (>= 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
     webrick (1.3.1)
     webshims-rails (1.15.6.2)
       rails (> 3.1.0)
@@ -420,6 +434,7 @@ DEPENDENCIES
   activeadmin!
   activeadmin_pagedown
   brakeman
+  byebug
   coffee-rails
   compass-rails
   devise
@@ -466,5 +481,6 @@ DEPENDENCIES
   turbolinks
   twitter
   uglifier
+  web-console (~> 2.0)
   webrick (>= 1.3.1)
   webshims-rails