Turn on better_errors in development.

Gemfile

@@ -73,6 +73,8 @@ group :development do
   # Installation of the debugger gem fails on Travis CI,
   # so we don't use it in the test environment
   gem 'debugger'
+  gem 'better_errors'
+  gem 'binding_of_caller'
 end
 
 # Markdown formatting for updates etc

Gemfile.lock

@@ -60,12 +60,18 @@ GEM
       multi_json (~> 1.0)
     arel (3.0.2)
     bcrypt-ruby (3.1.1)
+    better_errors (1.0.1)
+      coderay (>= 1.0.0)
+      erubis (>= 2.6.6)
+    binding_of_caller (0.7.2)
+      debug_inspector (>= 0.0.1)
     bluecloth (2.2.0)
     bootstrap-datepicker-rails (1.1.1.3)
       railties (>= 3.0)
     builder (3.0.4)
     cancan (1.6.10)
     chunky_png (1.2.8)
+    coderay (1.1.0)
     coffee-rails (3.2.2)
       coffee-script (>= 2.2.0)
       railties (~> 3.2.0)
@@ -91,6 +97,7 @@ GEM
     csv_shaper (1.0.0)
       activesupport (>= 3.0.0)
     dalli (2.6.4)
+    debug_inspector (0.0.2)
     debugger (1.6.1)
       columnize (>= 0.3.1)
       debugger-linecache (~> 1.2.0)
@@ -255,6 +262,8 @@ PLATFORMS
 DEPENDENCIES
   active_utils (= 1.0.5)!
   activemerchant (= 1.33.0)!
+  better_errors
+  binding_of_caller
   bluecloth
   bootstrap-datepicker-rails
   bundler (>= 1.1.5)

app/controllers/home_controller.rb

@@ -9,6 +9,9 @@ class HomeController < ApplicationController
     # caching will be effective.
 
     respond_to do |format|
+      foo = "bar"
+      @fred = "barney"
+      raise "ohno! #{@fred}"
       format.html # index.html.haml
     end
   end