Post.author() return meta author or BLOG_AUTHOR
Add author metadata to sample post
changes:Post.author()
Update CHANGES.txt
Revert "Update CHANGES.txt"

This reverts commit 54839d55bf8ed5b2af7d0f1e34dbd43a73c37df2.
right issue id
Use Post.author() in RSS
Merge pull request #1117 from getnikola/meta-author