Update and version control pods to compile properly in xcode 8

[apparition47]

This is a great project, however, I couldn't get it to build properly the first time in xcode 8. The included ver of Alamofire was giving me compile-time errors. I updated the pods to the latest minor ver and it seems to have fixed my issues.

I also included the following in Podfile to fix the "use legacy swift language version" flag for each of the pods. (A lot of pods are now Swift 3 compatible but this project probably needs to be refactored to support them.)

# Use Legacy Swift Language Version
post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |configuration|
      configuration.build_settings['SWIFT_VERSION'] = "2.3"
    end
  end

Thanks!

P.S. Also I was getting another error because I didn't have SwiftGen installed. Maybe there should be a note about that in the README.md?