Ignore unversions Cocoapods files and Emacs temp files
Move example code into a separate directory
Remove all Git submodules to pave the way for Cocoapods integration
Move files from 'ReactiveAFNetworking' in 'AFNetworking-RACExtensions'

Brings file names into line with what current Xcode project templates (and AFNetworking) use
Ignore xcshareddata directories

- Use Cocoapods to reference external libraries (AFNetworking, ReactiveCocoa, Expecta, Specta)
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New project and workspace files

- Created new project file for AFNetworking-RACExtensions library
- Referenced third-party libraries (AFNetworking, ReactiveCocoa, Expecta, Specta) using Cocoapods
- New .xcworkspace file, courtesy of Cocoapods

NOTE: AFNetworking-RACExtensions.xcworkspace should be used instead of the corresponding .xcodeproject file! Failure to use the xcworkspace will lead to compilation problems!
Copy pod spec into project
Add prefix_header_file to pod spec
Get example code working again using Cocoapods
Run the static analyzer during compilation