Replace Application\Module::loadYamlConfig() with loadConfig()
Application\Module inherits from AbstractModule, not BaseModule
Merge branch '2.1-noiselabs' into develop
Create environment folders "dev" and "prod" under app/config
Add default robots.txt to avoid 404s
Adjust path to app.php in app/console because we now use "environment folders"
Set $env and $debug based on environmental variables "PPI_ENV" and "PPI_DEBUG"
Move default configuration to app/config/base, make "dev" and "prod" inherit from base
Move modules configuration from modules.php to app.php to lower the amount of config files