Adds org-jekyll to Emacs.

Org-jekyll is a publishing tool to get blog posts written in org-mode converted
to html files ready for the Jekyll Gem to parse them.

See: https://github.com/juanre/org-jekyll

Also:

  - Sets the bitbites blogging environment to export bitbites blog posts to the
    repostitory directly.
  - Adds ag.el -  a silver_searcher interface - to Emacs
  - Removes inf-ruby from packages since I use pry-emacs
  - Adds some new key bindings for org-mode and changed key bindings for magit