Initial version

The first public version of the plugin.

minimal functionality:

• DSL for configuring react-native projects
• compatibility mode that re-publish DSL as project.ext.react extra properties
• helper method for re-configuring android.packagingOptions section for JSC integration.
• registered two tasks without functionality

project changes:

• established QA/QC development loop
• defined roadmap for the plugin releases
• code coverage for code
• gradle public plugins repository in use