[#843] Added pagination for projects list

Pagination has been added for the projects list, including a general script in utils.py that takes care of the format of the pagination so that the number of items is never bigger than 9.
[#843] Added pagination for organisations and updates list
[#843] Resolve merge conflicts with 'feature/rsr_v3' branch
Merge pull request #857 from akvo/feature/843_v3_pagination

[#843] Added pagination for projects, organisations and updates list