Change update_dependencies to create new versions if a number or zip_url
has changed and handle updating or creating dependencies as needed.
This change allows tracking of which actual versions are installed in an
installation by creating archived version objects which the
installations link to.
Migrate conditions from previous version to new version if a new version
is created.
Fix sandbox login link
- Merge branch 'master' of github.com:SalesforceFoundation/mrbelvedere
- Fix bug in support for Sandbox users

Conflicts:
	mpinstaller/templates/mpinstaller/package_version_overview.html
Add extra columns and filters to PackageInstallationAdmin
Only show return to installer link on failure
Added progress bar styles for steps based on status
Merge branch 'master' of github.com:SalesforceFoundation/mrbelvedere
Removed "Page Description" placeholder