WIP burnup chart fix
- all stories and their points are now displayed correctly in the burnup chart.
- fixed teamvelocity missing in the keynumbers page and added a promises for the project model for this route.
- fixed a html tag error that occured on the "accepted stories per owner" page, added a <tbody></tbody> tag has fixed this.
- date transformer/serializer removed
- changed the buildurl for project so it'll load the current_velocity on a single project properly from now on