Loosen gem dependenies

oauth2.gemspec

@@ -2,14 +2,14 @@
 require File.expand_path('../lib/oauth2/version', __FILE__)
 
 Gem::Specification.new do |gem|
-  gem.add_dependency 'faraday', '~> 0.7.4'
-  gem.add_dependency 'multi_json', '~> 1.0.3'
-  gem.add_development_dependency 'multi_xml', '~> 0.4'
-  gem.add_development_dependency 'rake', '~> 0.9'
-  gem.add_development_dependency 'rdoc', '~> 3.9'
-  gem.add_development_dependency 'rspec', '~> 2.6'
-  gem.add_development_dependency 'simplecov', '~> 0.4'
-  gem.add_development_dependency 'yard', '~> 0.7'
+  gem.add_dependency 'faraday', '~> 0.7'
+  gem.add_dependency 'multi_json', '~> 1.0'
+  gem.add_development_dependency 'multi_xml'
+  gem.add_development_dependency 'rake'
+  gem.add_development_dependency 'rdoc'
+  gem.add_development_dependency 'rspec'
+  gem.add_development_dependency 'simplecov'
+  gem.add_development_dependency 'yard'
   gem.authors = ["Michael Bleigh", "Erik Michaels-Ober"]
   gem.description = %q{A Ruby wrapper for the OAuth 2.0 protocol built with a similar style to the original OAuth gem.}
   gem.email = ['michael@intridea.com', 'sferik@gmail.com']