Update to match ButterKnife 8.0.1

• Non-local R references are now supported using string literals like @BindView("android.R.id.button1").
• Plugin now handles adding dependencies to the project.

Solves the non-final id problem. Relevant issues:

• Issue #2 - Add Support For Non-Final IDs
• Issue #45 - Library project issue
• Issue #100 - Injection does not work in library projects
• Issue #123 - take field/method name as default id