Alamofire3

Updated project, source and documentation for Xcode 8 beta 6.

Original Commit Log:

* Get build working on beta 6.
* Fix tests.
* Remove team.
* Clean up whitespace.
* Mark as private instead of fileprivate.
* Get rid of intermediate value.
* Open up the classes.
* Remove extraneous set of parens.
* Refactor some casts, remove most uses of AnyObject, properly encode Bool.
* Add bytesReceived variable.
* Make casts optional.
* Cleanup whitespace.
* Replaced optional CFString cast with non-optional variant.
* Removed unnecessary cast for parameters in ResponseTests.