update curl redirection process.

git-svn-id: https://plugins.svn.wordpress.org/mytory-markdown/trunk@955278 b8457f37-d9ea-0310-8a92-e5e31aec5664
version string

git-svn-id: https://plugins.svn.wordpress.org/mytory-markdown/trunk@955279 b8457f37-d9ea-0310-8a92-e5e31aec5664