add back #soap_fault/#http_error readers to Response

These two methods were removed in the big refactoring for the major release.
Add them back since they are the only API to access the errors when the client
is configured with `:raise_errors => false`.

Fixes savonrb#450

lib/savon/response.rb

@@ -10,10 +10,11 @@ def initialize(http, globals, locals)
       @globals = globals
       @locals  = locals
 
+      build_soap_and_http_errors!
       raise_soap_and_http_errors! if @globals[:raise_errors]
     end
 
-    attr_reader :http, :globals, :locals
+    attr_reader :http, :globals, :locals, :soap_fault, :http_error
 
     def success?
       !soap_fault? && !http_error?
@@ -66,9 +67,14 @@ def xpath(path, namespaces = nil)
 
     private
 
+    def build_soap_and_http_errors!
+      @soap_fault = SOAPFault.new(@http, nori) if soap_fault?
+      @http_error = HTTPError.new(@http) if http_error?
+    end
+
     def raise_soap_and_http_errors!
-      raise SOAPFault.new(@http, nori) if soap_fault?
-      raise HTTPError.new(@http) if http_error?
+      raise soap_fault if soap_fault?
+      raise http_error if http_error?
     end
 
     def raise_invalid_response_error!

spec/savon/response_spec.rb

@@ -53,6 +53,18 @@
     end
   end
 
+  describe "#soap_fault" do
+    before { globals[:raise_errors] = false }
+
+    it "should return nil in case the response seems to be ok" do
+      soap_response.soap_fault.should be_nil
+    end
+
+    it "should return a SOAPFault in case of a SOAP fault" do
+      soap_fault_response.soap_fault.should be_a(Savon::SOAPFault)
+    end
+  end
+
   describe "#http_error?" do
     before { globals[:raise_errors] = false }
 
@@ -65,6 +77,18 @@
     end
   end
 
+  describe "#http_error" do
+    before { globals[:raise_errors] = false }
+
+    it "should return nil in case the response seems to be ok" do
+      soap_response.http_error.should be_nil
+    end
+
+    it "should return a HTTPError in case of an HTTP error" do
+      soap_response(:code => 500).http_error.should be_a(Savon::HTTPError)
+    end
+  end
+
   describe "#header" do
     it "should return the SOAP response header as a Hash" do
       response = soap_response :body => Fixture.response(:header)