Remove Nokogiri < 1.6 restriction and explain in the README how to ge…

…t things working on Ruby 1.8.x.

README.md

@@ -13,6 +13,12 @@ dependency (aws-sdk follows [semantic versioning](http://semver.org/)):
 
     gem 'aws-sdk', '~> 1.0'
 
+If you are using a version of Ruby older than 1.9, you may encounter problems with Nokogiri.
+The authors dropped support for Ruby 1.8.x in Nokogiri 1.6. To use aws-sdk, you'll also have
+to install or specify a version of Nokogiri prior to 1.6, like this:
+
+    gem 'nokogiri', '~> 1.5.0'
+
 ## Basic Configuration
 
 You need to provide your AWS security credentials and choose a default region.

aws-sdk.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.homepage = 'http://aws.amazon.com/sdkforruby'
 
   s.add_dependency('uuidtools', '~> 2.1')
-  s.add_dependency('nokogiri', '>= 1.4.4', '< 1.6.0') # 1.6 no longer supports Ruby 1.8.7
+  s.add_dependency('nokogiri', '>= 1.4.4')
   s.add_dependency('json', '~> 1.4')
 
   s.files = [