CocoaPods 0.36.rc.1 - Pod Authors Guide to CocoaPods Frameworks

The extracted article from #59.
Think it might be smart to include a mention (after the fold) of the 0.36 blog post PR - https://github.com/CocoaPods/blog.cocoapods.org/pull/59 so that people can take a look if interested in what we consider to be the 0.36 release to look like for end-users.