add merge to glossary

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add fast forward (in addition to fast-forward) to glossary

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

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

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

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

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

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

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

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

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