Reorganize output functions, add comments, and adjust formatting. Also output the Open Graph Metadata even if QuickShare is not being automatically displayed, so that the data is provided when the custom output functions are used. Only output og:image if there is some image defined there (including the fallback image).

git-svn-id: https://plugins.svn.wordpress.org/quickshare/trunk@776733 b8457f37-d9ea-0310-8a92-e5e31aec5664