Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/nginx/libraries/nginx_version.rb

@@ -0,0 +1,37 @@
+class NginxVersion
+  include Comparable
+
+  attr_reader :version
+
+  def initialize(version)
+    @version = version
+  end
+
+  def <=>(other)
+    lhsegments = segments
+    rhsegments = other.segments
+
+    parts = [lhsegments.size, rhsegments.size].max
+
+    (0..(parts - 1)).each do |index|
+      lhs = lhsegments[index] || 0
+      rhs = rhsegments[index] || 0
+
+      next if lhs == rhs
+
+      return lhs <=> rhs
+    end
+
+    0
+  end
+
+  def to_s
+    version
+  end
+
+  protected
+
+  def segments
+    version.split('.').map { |part| Integer(part) }
+  end
+end