Fixed Facebook init tag to retrieve API key from service provider if it isn't explicitly specified in apiKey attribute.
Fixed Facebook init tag to retrieve API key from service provider if it isn't explicitly specified in apiKey attribute.

pkdevbox/spring-social-github,cpitman/spring-social-auth0,spring-projects/spring-social-github,spring-projects/spring-social-github,cpitman/spring-social-auth0,pkdevbox/spring-social-github