Use bundler for gem management

* Added a Gemfile
* Modified the installation instructions in README.md to reflect
  these changes.

Author: kgrz

Gemfile

@@ -0,0 +1,8 @@
+source "https://rubygems.org" 
+
+gem "kramdown"
+gem "nokogiri", '>= 1.5.9'
+gem "jekyll", '>= 1.1.0'
+gem "rdoc", '~> 3.9.0'
+gem "haml"
+gem "thor"

Gemfile.lock

@@ -0,0 +1,53 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    classifier (1.3.3)
+      fast-stemmer (>= 1.0.0)
+    colorator (0.1)
+    commander (4.1.5)
+      highline (~> 1.6.11)
+    directory_watcher (1.4.1)
+    fast-stemmer (1.0.2)
+    haml (4.0.3)
+      tilt
+    highline (1.6.19)
+    jekyll (1.1.2)
+      classifier (~> 1.3)
+      colorator (~> 0.1)
+      commander (~> 4.1.3)
+      directory_watcher (~> 1.4.1)
+      kramdown (~> 1.0.2)
+      liquid (~> 2.5.1)
+      maruku (~> 0.5)
+      pygments.rb (~> 0.5.0)
+      redcarpet (~> 2.2.2)
+      safe_yaml (~> 0.7.0)
+    kramdown (1.0.2)
+    liquid (2.5.1)
+    maruku (0.6.1)
+      syntax (>= 1.0.0)
+    mini_portile (0.5.1)
+    nokogiri (1.6.0)
+      mini_portile (~> 0.5.0)
+    posix-spawn (0.3.6)
+    pygments.rb (0.5.2)
+      posix-spawn (~> 0.3.6)
+      yajl-ruby (~> 1.1.0)
+    rdoc (3.9.5)
+    redcarpet (2.2.2)
+    safe_yaml (0.7.1)
+    syntax (1.0.0)
+    thor (0.18.1)
+    tilt (1.4.1)
+    yajl-ruby (1.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  haml
+  jekyll (>= 1.1.0)
+  kramdown
+  nokogiri (>= 1.5.9)
+  rdoc (~> 3.9.0)
+  thor

README.md

@@ -12,10 +12,13 @@ Grab the sources from GitHub:
     $ git clone git://github.com/sinatra/sinatra.github.com.git
     $ cd sinatra.github.com
 
+Make sure you have the `bundler` gem installed on your machine:
+
+    $ gem install bundler
+
 Install dependencies:
 
-    $ gem install jekyll
-    $ gem install rdoc -v 2.3.0
+    $ bundle install
 
 Run the test server:
 

Rakefile

@@ -3,6 +3,7 @@ require 'rake/clean'
 require 'rdoc'
 require 'rdoc/encoding'
 require 'rdoc/markup/to_html'
+require 'rdoc/options'
 require 'uri'
 require 'nokogiri'
 require 'kramdown'
@@ -131,7 +132,7 @@ contrib("_contrib/doc/%s.rdoc") { |fn| file fn => '_contrib' }
 contrib do |fn|
   file "_includes/#{fn}.html" => ["build:contrib_docs", "_contrib/doc/#{fn}.rdoc", "Rakefile"] do |f|
     html =
-      RDoc::Markup::ToHtml.new
+      RDoc::Markup::ToHtml.new(RDoc::Options.new)
       .convert(File.read("_contrib/doc/#{fn}.rdoc"))
     File.open(f.name, 'wb') { |io| io.write html }
   end