[#890] Added first version of timeline

A timeline (using timeline.js) is added to the project main page. It currently shows:
- Date start / end (planned if actual is not filled in)
- Project updates
- Donations
[#890] Removed debug=True for timeline.js
[#890] Merged 'feature/rsr_v3' into branch
Merge pull request #892 from akvo/feature/890_v3_timeline

[#890] Added first version of timeline