Update Phoenix to Plug 0.8.3 with new error handling
Add debug error handling to Phoenix
Improve integration tests
Improve coverage for code reloader
Add new error rendering layer
Update the template for new applications
Improve coverage and documentation for new error handling
Merge pull request #485 from phoenixframework/jv-new-errors

New error handling for Phoenix
Fix Router example
Bring readme up to 0.6.0 conventions
Cannot pipe_through inside a pipeline