Merge branch 'for_update_of' of github.com:mlassnig/sqlalchemy into for_update_of

diff --cc lib/sqlalchemy/dialects/mysql/base.py
Simple merge

diff --cc lib/sqlalchemy/dialects/oracle/base.py
Simple merge

diff --cc lib/sqlalchemy/orm/query.py
Simple merge

diff --cc lib/sqlalchemy/sql/compiler.py
Simple merge

diff --cc lib/sqlalchemy/sql/selectable.py
Simple merge