Only start a session if not already begun
Only start a session if not already begun

As reported (on the WordPress forums)[https://wordpress.org/support/topic/session-error?replies=5#post-7367159]
vrcAlbert/wp-mvc,jdearaujo/wp-mvc,lordthorzonus/wp-mvc,vrcAlbert/wp-mvc,tombenner/wp-mvc,cyberscribe/wp-mvc,cyberscribe/wp-mvc,lordthorzonus/wp-mvc,tombenner/wp-mvc,jdearaujo/wp-mvc