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

The extracted article from #59.

#### TODOs
* [x] Explain `module_name`
* [x] Review, stylistic improvements, fix typos, …
* [x] Add the assets
* [ ] Update **pygments.rb** to a version, which brings a lexer for Swift
@orta: That's sadly not the same. A Clean in Xcode mostly only varnishes files, which would be produced again by the current target setup, if you move files around, or change header visibility this is often only to fix by nuking DerivedData manually on file system.