Small changes to the readme.txt

git-svn-id: https://plugins.svn.wordpress.org/twine-social/trunk@1022277 b8457f37-d9ea-0310-8a92-e5e31aec5664
Small changes to the readme.txt

git-svn-id: https://plugins.svn.wordpress.org/twine-social/trunk@1022278 b8457f37-d9ea-0310-8a92-e5e31aec5664
Small changes to the readme.txt for Chromecast keywords

git-svn-id: https://plugins.svn.wordpress.org/twine-social/trunk@1022279 b8457f37-d9ea-0310-8a92-e5e31aec5664