use redcarpet to process markdown

Gemfile

@@ -2,7 +2,4 @@ source 'https://rubygems.org'
 
 gem "jekyll",     '=1.0.3'
 gem 'liquid',     '=2.5.0'
-gem 'redcarpet',  '=2.2.2'
-gem 'maruku',     '=0.6.1'
-gem 'rdiscount',  '=1.6.8'
-gem 'RedCloth',   '=4.2.9'
+gem 'redcarpet',  '=2.2.2'

Gemfile.lock

@@ -1,7 +1,6 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    RedCloth (4.2.9)
     classifier (1.3.3)
       fast-stemmer (>= 1.0.0)
     colorator (0.1)
@@ -28,7 +27,6 @@ GEM
     pygments.rb (0.5.1)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rdiscount (1.6.8)
     redcarpet (2.2.2)
     safe_yaml (0.7.1)
     syntax (1.0.0)
@@ -38,9 +36,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  RedCloth (= 4.2.9)
   jekyll (= 1.0.3)
   liquid (= 2.5.0)
-  maruku (= 0.6.1)
-  rdiscount (= 1.6.8)
   redcarpet (= 2.2.2)

_config.yml

@@ -1,5 +1,7 @@
 title: ChooseALicense.com
 relative_permalinks: false
+markdown: redcarpet
+
 rules:
 
   required: