Many fixes

Fixes #21. Works on #18. Works on #17. Fixes #15. 

Changes: 
- Helper methods "get_by_user" for Organization, UserProfile.
- Fix breadcrumbs (now using standard Lizard functions)
- Fix links to project pages (now using {% url %} template tags)
- Improve layout of project pages
- Add remove link to uploaded files
- Hopefully fix bug with plupload (issue lizard_progress #16) (add an
  extra refresh() call after it becomes visible)
- Create locations if they don't exist yet and organizations wants that
- Create scheduled measurements if they don't exist yet and organization wants
  that
- Move CSV download to downloads instead of dashboard
- Move project admin into the sidebar
- Sort out view subclassing
- Add contractor to progress graph
- Update lizard versions for testing