added activesupport dependency

Rakefile

@@ -22,6 +22,7 @@ begin
     gem.authors = ["morellon", "fnando", "rafaelrosafu", "dalcico"]
     gem.add_development_dependency "rspec"
     gem.add_dependency "ffi"
+    gem.add_dependency "activesupport"
   end
   Jeweler::GemcutterTasks.new
 rescue LoadError

lib/rrd.rb

@@ -4,42 +4,42 @@
 require "rrd/base"
 require "rrd/graph"
 require "rrd/builder"
-require "rrd/ext/fixnum"
+require "rrd/time_extension"
 
 module RRD
   extend self
-  
+
   BANG_METHODS = [:graph!]
-  
+
   def graph(image_file, options = {}, &block)
     graph = Graph.new(image_file, options)
     graph.instance_eval(&block)
     graph.save
   end
-  
+
   def error
     Wrapper.error
   end
-  
+
   def to_line_parameters(hash, known_flags = [])
     used_flags = []
     known_flags.each do |flag|
       used_flags << "--#{flag}".gsub(/_/, "-") if hash.delete(flag)
     end
-    
+
     line_params = []
     hash.each_pair { |key,value| line_params += ["--#{key}".gsub(/_/, "-"), value.to_s] }
     line_params = Hash[*line_params]
-    
+
     params = []
     line_params.keys.sort.each { |key| params += [key, line_params[key]] }
     used_flags + params
   end
-  
+
   def methods
     super + BANG_METHODS
   end
-  
+
   def bang(method, *args, &block)
     result = send(method, *args, &block)
     raise error unless result

lib/rrd/time_extension.rb

@@ -0,0 +1,18 @@
+require 'active_support/version'
+
+if ActiveSupport::VERSION::MAJOR >= 3
+  require 'active_support/core_ext/numeric/time'
+  require 'active_support/core_ext/integer/time'
+else
+  require 'active_support/duration'
+  require 'active_support/core_ext/numeric/time'
+  require 'active_support/core_ext/integer/time'
+
+  class Numeric
+    include ActiveSupport::CoreExtensions::Numeric::Time
+  end
+
+  class Integer
+    include ActiveSupport::CoreExtensions::Integer::Time
+  end
+end