Adding missing files in Pods directory.

When following the instructions from a clean clone of the project, the pod install
step will find the directories and the podspec gems and will not try to reinstall
the missing files.

Some files weren't added in commit 6d463d since they matched the
.gitignore file. Also, some files where there and don't belong exactly to the
pods. I removed them. Finally, I updated one file from SVPullToRefresh that
were changed in their HEAD.

See CocoaPods/CocoaPods#733 for more information.