Restricts app name to 16 characters

Fixes #41
Merge pull request #42 from openminds/bug/db_name_too_long

Restricts app name to 16 characters
Updates Vagrantfile to v2 syntax to fix memory bug

Fixes bug where Vagrant would not set memory correctly
Merge pull request #43 from openminds/bug/memory

Updates Vagrantfile to v2 syntax to fix memory bug