vim-patch:7.4.421

Problem:    Crash when searching for "\ze*". (Urtica Dioica)
Solution:   Disallow a multi after \ze and \zs.

https://code.google.com/p/vim/source/detail?r=v7-4-421
vim-patch:7.4.437

Problem:    New and old regexp engine are not consistent.
Solution:   Also give an error for "\ze*" for the old regexp engine.

https://code.google.com/p/vim/source/detail?r=v7-4-437
Merge #1322 'vim-patch:7.4.421 + vim-patch:7.4.437'