Updates podspec and markdown file.

Hey Grant,
I came across your project in 'Podlife' for iOS after you submitted your .podspec to the Cocoapods repository. A misspelling in the homepage url prevented me from viewing information about you or your project from the app, so if nothing else I would like to bring that to your attention. Also, the common practice seems to be to use the homepage in the podspec as the projects homepage and not the authors to simplify viewing more information about the pod directly and I made those changes in this pull request.

Personally, I enjoyed perusing your code and will likely use your color interpolation in an application I am writing for my hue lights at home.

Thanks for adding to the pods community and I hope you find this useful!
Brian