Issue #279: Remove references to Postgres from doc blocks.
Issue #279: Remove Postgres-only path case transform option from views string argument handler.
Issue #279: Remove Postgres from requirements in README.
Merge pull request #521 from cafuego/279-drop-postgres-doc

Issue #279: Drop support for PostgresSQL.
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.