Added unit test to check if .gitignore gets copied correctly.
Uses __gitignore in place of .gitignore for new systems

Generify 1.1.0 automatically converts __gitignore into .gitignore.

Closes https://github.com/nearform/nscale/issues/32.
Merge pull request #55 from nearform/new-system-gitignore

Uses __gitignore in place of .gitignore for new systems