Update gems, switch redcarpet to gem reference now that 3.1 is released

Gemfile

@@ -13,7 +13,7 @@ gem 'middleman-gh-pages'
 # Live-reloading plugin
 gem "middleman-livereload", "~> 3.1.0"
 
-gem 'redcarpet', :git => 'https://github.com/vmg/redcarpet.git'
+gem 'redcarpet', '~> 3.1.1'
 
 # For faster file watcher updates on Windows:
 gem "wdm", "~> 0.1.0", :platforms => [:mswin, :mingw]

Gemfile.lock

-GIT
-  remote: https://github.com/vmg/redcarpet.git
-  revision: 48e0d676e62c964a59e382e8d852a53526c1b5c3
-  specs:
-    redcarpet (3.0.0)
-
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (3.2.16)
+    activesupport (3.2.17)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    chunky_png (1.2.9)
+    chunky_png (1.3.0)
     coffee-script (2.2.0)
       coffee-script-source
       execjs
@@ -33,7 +27,7 @@ GEM
     http_parser.rb (0.5.3)
     i18n (0.6.9)
     json (1.8.1)
-    kramdown (1.3.1)
+    kramdown (1.3.2)
     listen (1.3.1)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
@@ -84,6 +78,7 @@ GEM
       ffi (>= 0.5.0)
     rb-kqueue (0.2.0)
       ffi (>= 0.5.0)
+    redcarpet (3.1.1)
     rouge (1.3.2)
     ruby18_source_location (0.2)
     sass (3.2.14)
@@ -112,6 +107,6 @@ DEPENDENCIES
   middleman-livereload (~> 3.1.0)
   middleman-syntax
   rake (~> 10.1.0)
-  redcarpet!
+  redcarpet (~> 3.1.1)
   ruby18_source_location
   wdm (~> 0.1.0)