Add UIColor+RandomColors 0.1.0

Fixed issue with directory structure that was documented in previous pull request: https://github.com/CocoaPods/Specs/pull/10099

If there are any other issues with this, let me know if you'd prefer another pull request or if I should just put a new commit into this PR. I made a new PR since the Cocoapods instructions state to create the folder and .podspec in a single commit. 

Thanks!