{MDC iOS} No longer using `-init` for Color Scheme.
Based on the discussions in go/mdc-ios-theming, we should not use the `-init` default initializer. Instead, we should use an explicit set of defaults.
Search regex: '\[\[MDCSemanticColorScheme alloc\] init\]'
As part of our readme generator, components can now opt in to displaying badges in their readme.
The badges are generated from https://shields.io/ and are focused on an individual component. We're currently generating the following badges:
- Open bug count.
This discourages depending on all of a component's extensions and aligns our targets more closely with how we expect them to be imported and depended upon.
This is a breaking change.
Pivotal story: https://www.pivotaltracker.com/story/show/157118721
