Adding RPVerticalStepper with v0.0.1

This is the initial commit of RPVerticalStepper v0.0.1.  

>69-165-195-3:RPVerticalStepper rob$ pod spec lint RPVerticalStepper.podspec
-> RPVerticalStepper (0.0.1)
Analyzed 1 podspec.
RPVerticalStepper.podspec passed validation.

Repo is here: https://github.com/iwasrobbed/RPVerticalStepper