Merge branch 'master' into svn

git-svn-id: https://plugins.svn.wordpress.org/papercite/trunk@857214 b8457f37-d9ea-0310-8a92-e5e31aec5664
Stable version is 0.5.10

git-svn-id: https://plugins.svn.wordpress.org/papercite/trunk@857218 b8457f37-d9ea-0310-8a92-e5e31aec5664
Refactored broken custom post options (related to issue #80)