Use Spring Resource Instead of File for Factory Beans

[Marvin S. Addison]

I started using java-idp-testbed today and almost immediately I wanted 
to use classpath locations for setting up IdP and SP credentials. 
Unfortunately that's not possible at present, but it was straightforward 
to switch to org.springframework.core.io.Resource to support both 
file-based and classpath resources. That allows very axiomatic Spring 
configuration like the following:

     <bean id="testbed.idp.PrivateKey" 
class="net.shibboleth.ext.spring.factory.PrivateKeyFactoryBean"
           p:privateKey="classpath:/creds/idp.key" />

     <bean id="testbed.idp.X509Certificate" 
class="net.shibboleth.ext.spring.factory.X509CertificateFactoryBean"
           p:certificate="classpath:/creds/idp.crt" />

I made the patch available for review and hope you'll consider it.

https://gist.github.com/serac/7011620

I realize that there may be no use case for classpath resources in a 
real IdP configuration setting, but there's still some value due to 
increased brevity in the config.

I'm happy to file a Jira issue and attach the patch to it if you're 
interested.

Best,
M