Add a Gemfile to make building the documentation easier.

Use "bundle install" in the docs folder to install ruby dependencies.

docs/Gemfile

@@ -0,0 +1,4 @@
+source :rubygems
+
+gem "bonsai"
+gem "maruku"

docs/Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (3.2.9)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    addressable (2.3.2)
+    bonsai (1.4.7)
+      activesupport (>= 3.0.3)
+      builder (>= 3.0.0)
+      i18n (>= 0.5.0)
+      launchy (>= 0.3.7)
+      liquid (>= 2.2.2)
+      maruku (>= 0.6.0)
+      rack
+      sass
+      sinatra (>= 1.0)
+      tilt (>= 1.3)
+      watch (>= 0.1.0)
+    builder (3.1.4)
+    i18n (0.6.1)
+    launchy (2.1.2)
+      addressable (~> 2.3)
+    liquid (2.4.1)
+    maruku (0.6.1)
+      syntax (>= 1.0.0)
+    multi_json (1.5.0)
+    rack (1.4.1)
+    rack-protection (1.3.2)
+      rack
+    sass (3.2.3)
+    sinatra (1.3.3)
+      rack (~> 1.3, >= 1.3.6)
+      rack-protection (~> 1.2)
+      tilt (~> 1.3, >= 1.3.3)
+    syntax (1.0.0)
+    tilt (1.3.3)
+    watch (0.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bonsai
+  maruku