Merge pull request #77 from albinsunnanbo/FixSampleApplicationConfig

Fix config in SampleApplication to use local idp and load certificate from file
Select SignIn IDP based on the issuer query string argument if present, use the default IDP if not present

- Update SampleApplication and SampleMvcApplication to list all configured IDP:s and link to the login for each of them
- Replace first page in SampleMvcApplication with the more informative first page from SampleApplication
- Configure SampleApplication and SampleMvcApplication to use local idp as primary and stubidp.kentor.se as second idp
- Configure deployment configuration of the stubidp to use different issuer for debug and release deploy to facilitate the above scenario

Fix #2