Check that coffeescript installed version support --no-header option

If you have a coffee-script version < 1.7.0 the script will fail because of `--no-header` option not supported.

The idea of the patch is to find the coffee-script version 

For 1.6.3 version installed, the existing output is : 
```bash
$ ./bin/test.sh ios
[...]
/path/to/global/node_modules/coffee-script/lib/coffee-script/optparse.js:51
            throw new Error("unrecognized option: " + arg);
                  ^
Error: unrecognized option: --no-header
```
With this patch the ouput will be:

```bash
$ ./bin/test.sh ios
you have an older version (<1.7.0) of coffeescript which does not support --no-header option
Upgrade your coffeescript:
npm install -g coffee-script
```