Change Samigo ResourceLoader to use Sakai's ResourceLoader thereby enabling DB support for Message files

Simple change to use sakai's common ResourceLoader.

This enables the work from https://sakaiproject.atlassian.net/browse/SAK-18985#icft=SAK-18985

Index: samigo-app/src/webapp/WEB-INF/applicationContext.xml
===================================================================
— samigo-app/src/webapp/WEB-INF/applicationContext.xml (revision 103639)
+++ samigo-app/src/webapp/WEB-INF/applicationContext.xml (working copy)
@@ -13,7 +13,7 @@
</bean>

<bean id="messageSource"
- class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
+ class="org.sakaiproject.util.ResourceLoaderMessageSource">
<property name="basename" value="classpath:org/sakaiproject/tool/assessment/bundle/DeliveryMessages"/>
</bean>

Tested this in sakai trunk no issues.