Issue #356: Replace favicon with 'home' icon in Admin Bar.
Merge branch '1.x' of github.com:backdrop/backdrop into 1.x
Issue #178: Convert fields to configuration.
Merge pull request #525 from quicksketch/178/field_config

Issue #178: Convert fields to configuration.
Issue #178: Adding docs for label_callback from field conversion.
Merge branch '178/field_config' into 1.x
Issue #170: Converting file system, clean URL, and private key variables to config.
Issue #410: Remove "Minimum Cache Lifetime" option.
Merge pull request #526 from quicksketch/170/variable_complete

Issue #170 and #410: Further convert core variables to config. Remove minimum cache lifetime.