Peace Corps Projects pages

WIP. Not ready to merge yet.

Includes:
- [x] view and template for the donate landing page
- [x] models, view, and template for individual projects
- [x] models, view, and template for issues

Still needs doing:
- [ ] make the templates presentable
- [ ] set media root, which determines where filefields upload to
- [ ] set image urls so they can be included in templates
- [ ] country fund pages
- [ ] general fund page
- [ ] special funds