Zie sells z shells by the z shore: full ZSH support

* Superior import method to bash - loads modules at runtime, rather than appending to a file in `~`. Allows cleaner updates and edits.
* Slightly nicer prompt thanks to zsh - right-floated `git` branch (as well as dirty and unsynced indicators) and clock
* Some new aliases and functions (reflected in bash where applicable)
* Remove old `iosinspect` script - iOS 6 fixed that issue

Moving to `zsh` has been an interesting and useful transition. The shell feels more powerful at the surface, and the extended globbing alone has allowed this to be much more flexible when run in that environment.

This merge represents `zsh` becoming the "default" shell for future development. I've tried to keep bash at feature parity (and it pretty much is right now), but I don't think I'll do much more than keeping it working where necessary, as I can now use a compatible `zsh` in most environments I need to be in.