naga v1.0

Naga is a terminal implementation of snake game. URL: http://github.com/anayjoshi/naga.
This is a first time addition of this project in homebrew. The project has existed for quite some time, the github repository was refurnished today.
I have updated the same branch (naga) after incorporating your suggestions. brew audit stills throws the error:

```
naga:
 * use "scons *args" instead of "system 'scons', *args"
```
If I use `make` instead of `scons`, it does not show this error. How is `scons` a special case?