fix include path

- setup include path relative to project root
- improved documentation, fixed formatting
upgrade database configuration, add setup .sql

- added configure path, included as array w/ relative path
- Db class is configurable in file, include credentials outside git
- sql script to create basic database structure
project misc improvements

- add 'predis' to required libraries in composer
- upgrade generate_datamap for use with Db changes
- rename Rain class, minor fixes, improvements ...