[WIP] Feature/git helpers

Feature branch for:
- Git helpers
- "Gulp" deploy command (deploy CSS/JS files, which are compiled locally, to the target server)

More infos:
https://divio-ch.atlassian.net/browse/TECH-1
Cool, but why only uploading the statics? Could upload everything (but if you feel that it's out of scope for this task we can look at it later).