Launch cuckooJS on a empty repo is not possible

[w3dani]

Currently when cuckoo-cli is launched it requests a name that will be used as the main folder of the new project. Once the directory is created, git is initialized inside. If we create the folder (because we've cloned and empty repo to start working on) and we launch the cli, it fails because the folder already exists.

Cuckoo must support cloning an empty repo and scaffold code inside without initilizing git.