Add `developFromFileSystem`

Useful when you develop a plugin and want it to just copy files than use
steady commit states. I don't think regular antigen has this.
Recursive clone
Added an update function

Conflicts:
	init.zsh
Very crude functions for update and adding bundles
Refactored code
Added remove
Handles the case when bundles file is not available
Now the list is not printed everytime we remove a bundle