Replace String#blank? with its implementation

Author: porras

lib/oauth/request_proxy/action_controller_request.rb

@@ -67,7 +67,7 @@ def parameters_for_signature
 
       params.
         join('&').split('&').
-        reject(&:blank?).
+        reject { |s| s.match(/\A\s*\z/) }.
         map { |p| p.split('=').map{|esc| CGI.unescape(esc)} }.
         reject { |kv| kv[0] == 'oauth_signature'}
     end

lib/oauth/request_proxy/base.rb

@@ -146,7 +146,7 @@ def query_string_blank?
       if uri = request.env['REQUEST_URI']
         uri.split('?', 2)[1].nil?
       else
-        request.query_string.blank?
+        request.query_string.match(/\A\s*\z/)
       end
     end