Revert "Merge pull request #282 from Saftophobia/C4_Sarah_Fathallah_Messaging_System_between_investor_and_startups_#237"

This reverts commit c33c8e88fdb0a6048a35cac95bc64f1c99c4a885, reversing
changes made to 155a90e6515b1b12eff53bbf171d41fbba2f4670.
Added database.yml