update lastest code from main original rrssb github

git-svn-id: https://plugins.svn.wordpress.org/ridiculously-responsive-social-sharing-buttons/trunk@925395 b8457f37-d9ea-0310-8a92-e5e31aec5664
add pocket.svg

git-svn-id: https://plugins.svn.wordpress.org/ridiculously-responsive-social-sharing-buttons/trunk@925396 b8457f37-d9ea-0310-8a92-e5e31aec5664