added php 5.3 check to main file

git-svn-id: https://plugins.svn.wordpress.org/feed-them-social/trunk@998030 b8457f37-d9ea-0310-8a92-e5e31aec5664
added php 5.3 check to main file

git-svn-id: https://plugins.svn.wordpress.org/feed-them-social/trunk@998032 b8457f37-d9ea-0310-8a92-e5e31aec5664