remove .DS_Store, Thumbs.db from .gitignore

Why do they need only for Win / Mac users? XD
They should be locally ignoreed on each environment.
remove composer.phar from .gitignore

This should be properly treated on each local environment.
PHPUnit: add whitelist for the code coverage
remove Welcome Controller & View
remove Example test
exclude .git* files from archive
remove default User Model & View
remove default BaseController
rewrite composer.json for this project