Merge Shawna's branch of Release 1

Squashed commit of the following:

commit c47070b63fd3d3795775e8b4c1831f89e2b57b75
Author: Zee Spencer <zee@zeespencer.com>
Date:   Fri Feb 14 15:28:16 2014 -0800

    Fix link to add a pet

    * Buttons don't appear to be able to hold links.
    * Indentation should use spaces, not tabs

commit 95d3a5c65b4438487024292b9cdf93e1a3627cde
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Wed Feb 12 20:48:46 2014 -0800

    Extra validation on new pet page to prevent guest user from creating pets

commit c1691d4639ae8ba647aa1f416dcd0b77615dab09
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Wed Feb 12 20:33:34 2014 -0800

    Only signed in users can add a pet

commit 689b7740a5f546728a6b1f45ac5d43738ea1337f
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Wed Feb 12 20:31:51 2014 -0800

    Add sign in, sign up, log out and edit profile links in navbar

commit b00f99abab6ce7462bcac7505978753c9d11ea04
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Wed Feb 12 20:04:44 2014 -0800

    Generate devise user model

commit cdf26de5285f3e2869c3a3961a894dfa90b37b6c
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Wed Feb 12 20:02:42 2014 -0800

    Install devise and do basic configuration. Generate devise views

commit 6bc7cbd01abf00f93e59e8a953b81e5fd660d5e4
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Mon Feb 10 20:50:42 2014 -0800

    More styling

commit cb6f250d346bff26af4bb9aa19b6b1a28fe81b52
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Thu Feb 6 22:23:52 2014 -0800

    Add bootstrap and some custom styling to pets index page.

commit 65d226dc7b662019901a144154205b9cba5792b2
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Thu Feb 6 22:00:47 2014 -0800

    Finish ability to create pets by adding create pet action and show pet page.

commit 852d855087fdae95a2b3d627afd9c79df1d65275
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Thu Feb 6 21:39:01 2014 -0800

    Add new pet action, view and pets form. Make 'All Pets' page the homepage.

commit 4fa17e649aa671e693007a2450878b828b13fb6d
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Thu Feb 6 21:12:32 2014 -0800

    Create index action for pets and the index view.

commit 8b7643545bcf1f8f16f701a3f140ccd72a772409
Author: Shawna Mattison <shawnamatt@gmail.com>
Date:   Thu Feb 6 21:06:31 2014 -0800

    Generate pets model and controller. Create routes for pets resource.