[Gemfile] Allow installing on jruby

Ensure all user projects are properly integrated

Add @import UIKit; or @import Cocoa; for generated main.m

Use release configuration with new linter

[PodTarget] Ensure the deployment target is high enough for frameworks

[Validator] Dont assume every pod target has a native target

[Spec::Edit] Use Executable.which

Create Info.plist files for resource bundles

[Repo Command] Add Ability to Add Custom Commit Message When Pushing Spec

Make it slightly easier to start contributing