Defer `compdef` calls until after `compinit -i` is called

Conflicts:
	antigen.zsh
process deferred compdefs in the order they were called
Merge branch 'master' of github.com:zsh-users/antigen
Don't load compinit module at startup.

Kills the whole purpose of the compdef deferrer function introduced in #37.
Completions are now correctly deferred and applied when `antigen-apply` is
called.
Fix line filtering grep in `-bundles` command.
Merge jmatth's fix for using relative path to `antigen.zsh`.
Code formatting.
Removing -q and -m as grep args.

Any instances using -q have been redirected to /dev/null.
Any instances using -m1 now use l or are piped into head -n1.
Merge branch 'fix_grep_flags'