[#889] Fixed provision file permissions

- changed owner to rsr on the shared directory
- changed permissions to 755 for dirs and 644 for files
- updated indentation to ruby standard 2 in Vagrantfile
Merge pull request #891 from akvo/feature/889_dev_experience

[#889] Fixed provision file permissions
[#893] Added simple carousel to project main page

Using React.Carousel, the project main page now has a carousel showing the photo belonging to the project and photos of the updates (if available). It probably needs some additional styling, since the photos look a bit stretched right now, but it is an initial version.
Merge pull request #894 from akvo/feature/893_v3_carousel

[#893] Added simple carousel to project main page
[#890] Merged 'feature/rsr_v3' into branch