Fix #533. Clear cached release XML during 'cc drush' or 'cc all'
Stop using deprecated key_exists().
Fix wrong variable name. Maybe this was subtly breaking some temporary file deletion?
Adds the creation time of the extension's .info file to projects. Similar to what update.module does.
Improvements to the update service xml parser to pick also release terms.
Add a drush backend to update_status engine. This backend is independent of update.module.
Fix typos.