Little style fix and note about iOS 5.1 specific code

The note is there for when support is dropped for iOS 5.1 :)
github: Added CONTRIBUTING.md

The document explains how to contribute to Firebolt. It has a step-by-step guide
which is great for people new to GitHub and also outlines the coding styles used
and the commands that can be run in the project.
sauce: Removed Windows 8 tests

They were pretty much redundant. Windows 8.1 tests should be enough.
src: Bump development version number