Add a :number key to Haml.version.

lib/haml/version.rb

@@ -12,13 +12,15 @@ module Haml
     # The `:major`, `:minor`, and `:teeny` keys have their respective numbers as Fixnums.
     # The `:name` key has the name of the version.
     # The `:string` key contains a human-readable string representation of the version.
+    # The `:number` key is the major, minor, and teeny keys separated by periods.
     # If Haml is checked out from Git, the `:rev` key will have the revision hash.
     # For example:
     #
     #     {
-    #       :string=>"2.1.0.9616393",
-    #       :rev => "9616393b8924ef36639c7e82aa88a51a24d16949",
-    #       :major => 2, :minor => 1, :teeny => 0
+    #       :string => "2.1.0.9616393",
+    #       :rev    => "9616393b8924ef36639c7e82aa88a51a24d16949",
+    #       :number => "2.1.0",
+    #       :major  => 2, :minor => 1, :teeny => 0
     #     }
     #
     # @return [Hash<Symbol, String/Fixnum>] The version hash
@@ -33,7 +35,8 @@ module Haml
         :teeny => numbers[2],
         :name => name
       }
-      @@version[:string] = [:major, :minor, :teeny].map { |comp| @@version[comp] }.compact.join('.')
+      @@version[:number] = [:major, :minor, :teeny].map { |comp| @@version[comp] }.compact.join('.')
+      @@version[:string] = @@version[:number].dup
 
       if File.exists?(scope('REVISION'))
         rev = File.read(scope('REVISION')).strip