added Serbian translation, updated version number to push out new version with new translation. all after testing with WP 3.9.2

git-svn-id: https://plugins.svn.wordpress.org/svg-support/trunk@962316 b8457f37-d9ea-0310-8a92-e5e31aec5664
update trunk stable tag to push out new version with new translation - added Serbian translation, updated version number. all after testing with WP 3.9.2

git-svn-id: https://plugins.svn.wordpress.org/svg-support/trunk@962319 b8457f37-d9ea-0310-8a92-e5e31aec5664