Issue 100: Add URL to projects

- Added URL column to projects
- Added URL (Website) field to projects form and projects admin
- Set Project name to link to project URL if present
Merge branch 'add_url_to_projects' of https://github.com/nburkley/codemontage into add_url_to_projects
show project url with icon instead of linking from title
add project url hyperlinks to admin pages