Allow disabling biostar bug reports through config settings.
Remove 'galaxy' tag as default now that we are using a custom biostar site.
Fix library permissions API controller.
Add an option to biostar integration to never authenticate.
Merged in dan/galaxy-central-stable-prs/stable (pull request #369)

BioStar fixes
If a tool shed repository was updated after a tool migration without a new installable changeset revision being generated, for example by adding or removing a readme file, the migration install framework would be unable to find repository dependencies. This changeset resolves that.
Merge fix from stable.