Added default gulp task
Added default gulp task

- Set default task to 'publish' so user's don't have guess/read source
- Set as a file, thus available also in external widgets that are re-using the gulp tasks

codeaudit/mozaik,backjo/mozaikdummyfork,plouc/mozaik,tlenclos/mozaik,juhamust/mozaik,michaelchiche/mozaik,tlenclos/mozaik,danielw92/mozaik,beni55/mozaik,danielw92/mozaik,michaelchiche/mozaik,codeaudit/mozaik,juhamust/mozaik,beni55/mozaik,backjo/mozaikdummyfork,plouc/mozaik