Add debugger gem

In order to facilitate future debugging, we are adding the debugger gem
to the project. As this is in the Gemfile generated by Rails, all that
was required to add it was uncomment the line in question and run
bundler.

[#41633207]

Gemfile

@@ -47,7 +47,7 @@ gem 'rvm-capistrano'
 gem 'capistrano-ext'
 
 # To use debugger
-# gem 'debugger'
+gem 'debugger'
 
 # Markdown formatting for updates etc
 gem 'bluecloth'

Gemfile.lock

@@ -49,6 +49,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.4.0)
+    columnize (0.3.6)
     commonjs (0.2.6)
     compass (0.12.2)
       chunky_png (~> 1.2)
@@ -58,6 +59,13 @@ GEM
       compass (>= 0.12.2, < 0.14)
     daemon_controller (1.1.0)
     daemons (1.1.9)
+    debugger (1.2.3)
+      columnize (>= 0.3.1)
+      debugger-linecache (~> 1.1.1)
+      debugger-ruby_core_source (~> 1.1.5)
+    debugger-linecache (1.1.2)
+      debugger-ruby_core_source (>= 1.1.1)
+    debugger-ruby_core_source (1.1.6)
     devise (2.2.0)
       bcrypt-ruby (~> 3.0)
       orm_adapter (~> 0.1)
@@ -207,6 +215,7 @@ DEPENDENCIES
   capistrano-ext
   coffee-rails (~> 3.2.1)
   compass-rails (~> 1.0.3)
+  debugger
   devise
   diff-lcs
   factory_girl_rails (~> 4.0)