Use release of rspec3

Fix issue with open ended dependency on active_support
Add Appraisals for testing rails3/rails4 dependencies and ignore output files in git

.gitignore

@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+gemfiles

Appraisals

@@ -0,0 +1,7 @@
+appraise "rails-3" do
+  gem "rails", "~> 3.2.16"
+end
+
+appraise "rails-4" do
+  gem "rails", "~> 4.0.0"
+end

spec/spec_helper.rb

@@ -17,5 +17,5 @@
   config.expect_with :rspec do |c|
     c.syntax = :expect
   end
-  config.color_enabled = true
+  config.color = true
 end

twitter_web_intents.gemspec

@@ -22,11 +22,12 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.test_files     = Dir.glob('spec/**/*')
 
-  spec.add_runtime_dependency 'activesupport', '>= 3.0'
+  spec.add_runtime_dependency 'activesupport', '>= 3','<= 4'
 
-  spec.add_development_dependency "bundler", ">= 1.3"
-  spec.add_development_dependency "rake", ">= 10"
-  spec.add_development_dependency "rspec", ">= 3"
+  spec.add_development_dependency "bundler", "~> 1.3"
+  spec.add_development_dependency "rake", "~> 10"
+  spec.add_development_dependency "rspec", "~> 3"
+  spec.add_development_dependency "appraisal", "~> 1"
 
   spec.add_development_dependency "simplecov", "~> 0" if RUBY_VERSION >= '1.9'
   spec.add_development_dependency "coveralls", "~> 0"