Add post hook on site generation

[ofZach]

I would find it useful to have a post hook after the site is generated, especially with the watch functionality where the site is generated on every change (which is very useful!). for example, a script could open or refresh a browser window or call sync files, etc.

[spf13]

This should be easy enough to add. We should add a prehook and a posthook
option to the config and command line.

I could take a stab at it in a couple days.

[spf13]

Thinking about this a bit more it should actually be a set of hooks that can be defined in the config. You should provide an optional extension, optional path and command to run. This should cover all bases for anything anyone would would as far as I can think of.

It covers the javascript compression case, the coffeescript case, the scss/sass case.

You could run an image compression or even push something to a remote server.

Probably the best way to do this is that the command would specify something like %file% in places where they would want the single changed file to be in the command.

Does this sound like it would work for everyone?

[redalastor]

Can I have different hooks when I run it as a server and when I package the site?

[redalastor]

When in server mode, I'd simply start compass watch or whatever_i_am_using watch.

It'd be nice I could start them as pre commands and have them killed when I kill the server.