ReactiveCocoa is licensed under the MIT license from v0.10.0

https://github.com/ReactiveCocoa/ReactiveCocoa/commit/542718333cbc5b82b01fa3bbc8262c35691b3bd0
Fix summary and description
Exclude private header files
Fix ordering
Fix indent
Fix private header definition
Merge pull request #4115 from ikesyo/reactivecocoa

Fix ReactiveCocoa podspecs