Remove explicit query param sorting

This fixed #192 and removes the sorting for query values.

Since this feature was used to support the now unsupported
  1.8.x, it can be removed.

Conflicts:
	spec/addressable/uri_spec.rb

lib/addressable/uri.rb

@@ -1607,9 +1607,6 @@ def query_values=(new_query_values)
           key = key.to_s if key.kind_of?(Symbol)
           [key, value]
         end
-        # Useful default for OAuth and caching.
-        # Only to be used for non-Array inputs. Arrays should preserve order.
-        new_query_values.sort!
       end
 
       # new_query_values have form [['key1', 'value1'], ['key2', 'value2']]

spec/addressable/uri_spec.rb

@@ -5696,9 +5696,10 @@ def to_str
     @uri.query.should == nil
   end
 
-  it "should correctly sort {'ab' => 'c', :ab => 'a', :a => 'x'}" do
+  it "should maintain original ordering: {'ab' => 'c', :ab => 'a', :a => 'x'}" do
     @uri.query_values = {'ab' => 'c', :ab => 'a', :a => 'x'}
-    @uri.query.should == "a=x&ab=a&ab=c"
+
+    @uri.query.should == "ab=c&ab=a&a=x"
   end
 
   it "should correctly assign " +