Add to Errata feature added to package show view.
Added a comments to values that need to be replaced once the Add to Errata API
details are known.
Changed spinner so it renders beside the Errata button.
Updated the res and uri for errata request.
Errata button now only displayed if current @package.task has bz integration.
Merge pull request #27 from FranciscoCanas/adderrata

Adderrata