release version 1.2

git-svn-id: http://plugins.svn.wordpress.org/spreaker-shortcode/trunk@952090 b8457f37-d9ea-0310-8a92-e5e31aec5664
clean up

git-svn-id: http://plugins.svn.wordpress.org/spreaker-shortcode/trunk@952146 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge remote-tracking branch 'git-svn'
Merge remote-tracking branch 'git-svn'
symlink readme.txt to README.md