add chain to glossary

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add index and index entry to glossary

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add master to glossary

Signed-off-by: Mattias Andrée <maandree@operamail.com>
split the merge entry todo into on todo for noun and one for verb

Signed-off-by: Mattias Andrée <maandree@operamail.com>