[#6482] import page for existing projects
[#6482] change page to show importers in a grid
[#6482] add a test for the importer admin page
[#6482] simpler logic to build matrix of importers (thanks Cory)
[#6526] Clean up individual tool importers

- Make forms look (slightly) better
- Add validation
- Kick off import as task

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] Fix typo

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] Fix MountPointValidator to provide default value

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] Better label on submit button

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] Handle c not having 'project' attr

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] Set c.project before calling MountPointValidator

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6526] bump Google Code & Trac Wiki importer versions for their changes
[#6611] provide mechanism to disable any allura entry point
put middleware back in proper place so error pages work correctly (bug introduced in 9a1363)
[#6595] Make 'tarball' controller handle GET and POST

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
[#6595] Show resubmit option if snapshot not found

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>