Now works on Windows

The generator wasn't working on windows as execSync is not supported on windows.
An error "Error: Dynamic Symbol Retrieval Error: "system": The handle is invalid." was raised.

This because the system() function doesn't exist on Windows.

fixed replacing execSync with exec
Update package.json

removed dependency exec-sync as not needed
Update package.json

fixed versions and authors
Merge pull request #4 from aledelgo/master

Now it works on windows.