Minor readme updates

git-svn-id: https://plugins.svn.wordpress.org/wp-parsely/trunk@1028935 b8457f37-d9ea-0310-8a92-e5e31aec5664
Switch over parsely-page to use JSON-LD. Fixes #11

git-svn-id: https://plugins.svn.wordpress.org/wp-parsely/trunk@1028936 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add support for multiple authors via coauthors plugin.

Resolves #17.

git-svn-id: https://plugins.svn.wordpress.org/wp-parsely/trunk@1028937 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version bump to 1.7

git-svn-id: https://plugins.svn.wordpress.org/wp-parsely/trunk@1028938 b8457f37-d9ea-0310-8a92-e5e31aec5664