Add support for hooks template, to implement custom lifecycle commands without overriding complete templates

[gigafied]

This is just an idea I had, maybe could be implemented a little differently.... if you're open to it, let me know and I'll write the tests.

[heartsucker]

Heya, sorry about the slow response. I actually need to do a major clean up on the all those scripts because they have lots of lintian errorts (#77). When I get around to that, I can revisit this.