Bump creole to ~> 0.5.0

Closes #2815

Gemfile

@@ -95,7 +95,7 @@ gem 'redcarpet',     '~> 3.3.3'
 gem 'RedCloth',      '~> 4.2.9'
 gem 'rdoc',          '~>3.6'
 gem 'org-ruby',      '~> 0.9.12'
-gem 'creole',        '~>0.3.6'
+gem 'creole',        '~> 0.5.0'
 gem 'wikicloth',     '0.8.1'
 gem 'asciidoctor',   '~> 1.5.2'

Gemfile.lock

@@ -134,7 +134,7 @@ GEM
       thor (~> 0.19.1)
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
-    creole (0.3.8)
+    creole (0.5.0)
     d3_rails (3.5.6)
       railties (>= 3.1.0)
     daemons (1.2.3)
@@ -816,7 +816,7 @@ DEPENDENCIES
   colored (~> 1.2)
   colorize (~> 0.5.8)
   coveralls (~> 0.8.2)
-  creole (~> 0.3.6)
+  creole (~> 0.5.0)
   d3_rails (~> 3.5.5)
   database_cleaner (~> 1.4.0)
   default_value_for (~> 3.0.0)