[#19]  Transaction model was created, added a validate_offer method in views.py
[#19] Working offer purchase. Next to do:  hash_links and purchase approval
Merge branch 'develop' into feature/purchase
clean code
[#19] Full transaction simulation.
Merge branch 'develop' into feature/purchase
clean init file
added missing part of code
minor code cleaning
Merge pull request #26 from zpidreamteam/feature/purchase

Feature/purchase