hiding sub-commands from Zsh

[Stig Brautaset]

Hi,

I made a small patch to support hiding the generated commands from the zsh history mechanism, similar to the `history -d` that is supported for BASH. Please consider this contribution in whatever license required, including public domain :-)

Here's my change, on top of a clone from master about 20 minutes ago:

https://code.google.com/r/sbrautaset-zsh-history/source/detail?r=b5ee574922e8a923cda3f497316c1349f9f4f675#

Note: I have only tested in in Zsh on OS X Mavericks.

Stig