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
I would propose:
> An error like above can appear, if you develop a framework in Xcode, and you alter header visibility to fix build problems like described previously and try to ensure a clean build state by executing the Clean action (**⌘+
⇧+K** in Xcode). In this situation, it can be helpful to nuke the products build directory (alas `DerivedData`) manually from the file system.