fixed a bug for generateCode

convert Promocodes to be eloquent model

added function to generate exact code name
added quanity for code
added expire_date check for each code

Merge branch 'master' of https://github.com/zgabievi/Promocodes

pull readme push fix

Monetary value fixes

typo fix

Update README.md

Update README.md

Merge branch 'master' of github.com:zgabievi/promocodes