Added: elixir-quoted-minor-mode

**Hi!**

I'm a fan of macros and I really miss some [slime](https://github.com/slime/slime) or [cider](https://github.com/clojure-emacs/cider) features about macro expansions in [emacs-elixir](https://github.com/elixir-lang/emacs-elixir).

So, this commit adds some interactivity for quoted expressions. Now, one can see a popup window with elixir highlighting and indentation instead of text message and close it with `q`.

![screen1](https://cloud.githubusercontent.com/assets/1789390/4050303/037afdfc-2d56-11e4-89d0-c660f5badcc3.png)