Add content and JQuery effects to the home page.

Changes the home page's content so that it is closer to what is desired.
JQuery effects and SCSS rules were added to transition between content,
but while the effects generally work for the development screen resolution,
the code is a mess, follows bad practices, and most likely will not work on
other resolutions. These issues will hopefully be addressed, for the most
part, in the next commit.

    - div#quote was added to app/views/welcome/index.haml.
    - app/assets/stylesheets/styles/welcome.scss was altered to position
      and style div#quote. Its ancestors were also changed around and
      renamed.
    - A JQuery function to transition out div#quote was added to
      app/assets/javascripts/welcome.js.
    - div#greeting was added to index.haml and it was styled.
    - Another JQuery function was written in welcome.js to transition
      in div#greeting.
    - The JQuery transition functions were generalized to work for other
      divisions.
    - div#secret and its styles were added, along with a mapped link that
      triggers its transition in.
    $ git add .
    $ git commit -F commit-message.txt
    $ git push origin master

Known problems to fix:

    - If the febrink.com logo link is clicked to reload the page, the JQuery
      effects stop working.
    - Sometimes, there is a strange delay between an event and the activation of
      its associated JQuery function.
    - Transitioning elements don't fade in and fade out at the same spot, which
      is desired.
    - If a duration is added to .fadeTo(  ), it makes the elements immediately
      at opacity 1. A better way to change the display from hidden while keeping
      opacity at 0 is probably available.
    - The link that is supposed to be on the fox's nose doesn't end up there
      for any other browser sizes.
    - Links for JQuery functions are currently set to use href='#'.
    - General messiness; the code is not DRY and has unnecessary elements.

Tests passing: 5
Tests failing: 0