Release 1.9.1, see readme.txt for changelog."

git-svn-id: https://plugins.svn.wordpress.org/slideshare/trunk@976382 b8457f37-d9ea-0310-8a92-e5e31aec5664
Remove another unneeded file

git-svn-id: https://plugins.svn.wordpress.org/slideshare/trunk@976386 b8457f37-d9ea-0310-8a92-e5e31aec5664