Update to version 1.7.1

git-svn-id: https://plugins.svn.wordpress.org/rotatingtweets/trunk@938456 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changing main file to version 1.7.1

git-svn-id: https://plugins.svn.wordpress.org/rotatingtweets/trunk@938458 b8457f37-d9ea-0310-8a92-e5e31aec5664