Making ActiveSupport dependency float, updating gemspec.

Gemfile

@@ -6,4 +6,4 @@ group :development do
   gem 'fakefs', :require => false
 end
 
-gem 'activesupport', :require => nil
+gem 'activesupport', '>= 3.0.0', :require => nil

annotate.gemspec

@@ -55,18 +55,21 @@ Gem::Specification.new do |s|
     s.specification_version = 3
 
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<active_support>, [">= 0"])
+      s.add_runtime_dependency(%q<activesupport>, [">= 3.0.0"])
       s.add_development_dependency(%q<jeweler>, [">= 0"])
       s.add_development_dependency(%q<rspec>, [">= 0"])
+      s.add_development_dependency(%q<fakefs>, [">= 0"])
     else
-      s.add_dependency(%q<active_support>, [">= 0"])
+      s.add_dependency(%q<activesupport>, [">= 3.0.0"])
       s.add_dependency(%q<jeweler>, [">= 0"])
       s.add_dependency(%q<rspec>, [">= 0"])
+      s.add_dependency(%q<fakefs>, [">= 0"])
     end
   else
-    s.add_dependency(%q<active_support>, [">= 0"])
+    s.add_dependency(%q<activesupport>, [">= 3.0.0"])
     s.add_dependency(%q<jeweler>, [">= 0"])
     s.add_dependency(%q<rspec>, [">= 0"])
+    s.add_dependency(%q<fakefs>, [">= 0"])
   end
 end