Emacs 23: don't require skewer or coffee-mode, which now depend on Emacs 24

See #160
Drop git-gutter-fringe, which I never use
Remove duplicated requirement of haml-mode
Make ag ignore archive-contents in this repo
Ignore /history
Use fullframe to run list-packages in a full-frame window
Adjust for updated fullframe API
Don't reindent so eagerly in haml-mode
Expand "-foo" to "modname-foo" in elisp with hippie-expand
string-prefix-p is better than regexp check
Do magic "-foo" to "modname-foo" expansion only after other expansions fail

Otherwise users of dash might get undesirable results.
Handle case where there's no `(provide ...)` form
Add check for emacs version on startup (see #161)
Don't reference paredit-backward-delete-key until paredit is loaded

See #161
Drop maxframe and init-maxframe
Don't rely on move-text-default-bindings, which has been removed upstream

Fixes #168, #169
Load magit-git-wip after magit, not directly after vc
Add site-lisp dirs to load-path after creation
Also use guide-key for narrowing map via "C-x n" prefix
Allow inline completions to cycle without eagerly popping up *Completions*