Feature/122 a open existing project

Is supposed to fix:

https://trello.com/c/87KAG3MC/135-after-creation-project-should-become-active

https://trello.com/c/ICL1j42g/136-make-open-project-work-without-a-page-reload

https://trello.com/c/QwEuPaqR/134-uploaded-spreadsheet-should-go-to-opened-project