Update to latest Tolk which doesn't depend on protected_attributes

Fixes #1455

Gemfile

@@ -45,7 +45,6 @@ gem 'bcrypt-ruby', '~> 3.0.0'
 group :development do
   gem "yard"
   gem "tolk", git: 'https://github.com/tolk/tolk'
-  gem 'protected_attributes' # needed for tolk. remove when tolk updates
   gem "bullet"
   gem "rack-mini-profiler"
 end

Gemfile.lock

@@ -16,7 +16,7 @@ GIT
 
 GIT
   remote: https://github.com/tolk/tolk
-  revision: da2888c181493027a68f04ba7e2b9060883cc464
+  revision: 06f99b3b747f2f8f7297fa35ec9c9d5f38eaada6
   specs:
     tolk (1.4.00)
       safe_yaml (~> 0.8)
@@ -128,8 +128,6 @@ GEM
     nokogiri (1.6.1)
       mini_portile (~> 0.5.0)
     polyglot (0.3.4)
-    protected_attributes (1.0.5)
-      activemodel (>= 4.0.1, < 5.0)
     rack (1.5.2)
     rack-mini-profiler (0.9.0)
       rack (>= 1.1.3)
@@ -232,7 +230,6 @@ DEPENDENCIES
   json
   mocha
   mysql2
-  protected_attributes
   rack-mini-profiler
   rails (~> 4.0.0)
   rails_autolink