Remove some unused variables
forms: Put comment-specific behaviour into its own subclass

This is causing problems when trying to reuse the Form object for
submitting new buildroot overrides, or redirect the user after
submitting an update.
updates: Redirect to the new update after submitting it
Merge pull request #74 from fedora-infra/feature/updates-redirect

Redirect the user after submitting an update
Link createrepo and deltarpm into our virtualenv
Fix a SA DetachedInstanceError with the masher tests
Move the populate method into bodhi.tests
Add the current bodhi1 metadata.py
Copy over the bodhi1 modifyrepo.py for now
Update the license on the metadata module
Port the metadata module to the new model
Use a proper tempfile for the pkgdb tag db
Determine the tag from the release & request instead of the mash config file

This also adds a few new arguments to the ExtendedMetadata constructor
Whitespace tweaks to the metadata module
The RepositoryNotFound exception has been removed
Default to the global mash config
Initial port of the basic metadata test
Update some DevBuildsys defaults to work with the metadata tests
Use the mashers logger
Allow our tests to change build tags with the DevBuildsys