Added symbolize_keys for hash.

lib/bravo.rb

@@ -3,6 +3,7 @@
 require "bravo/constants"
 require "savon"
 require "bravo/core_ext/float"
+require "bravo/core_ext/hash"
 module Bravo
 
   class NullOrInvalidAttribute < StandardError; end

lib/bravo/core_ext/hash.rb

@@ -0,0 +1,12 @@
+class Hash
+  def symbolize_keys!
+    keys.each do |key|
+      self[(key.to_sym rescue key) || key] = delete(key)
+    end
+    self
+  end
+
+  def symbolize_keys
+    dup.symbolize_keys!
+  end
+end