Merged from branch 'paperclip.' Users may now upload a profile picture and view others. DOES NOT USE IMAGEMAGICK BECAUSE IT'S HORRIBLE. Squashed commit of the following:

commit 2cede4235c6b473b9197bf50602617156f1b429f
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 01:38:09 2013 -0600

    Used default profile pic if user hasn't defined on yet.

commit 9f92b909aeea954041da11af849e0c6aeae71df9
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 01:30:24 2013 -0600

    Added default profile picture

commit a2b288c0ba10f1675bda89fd2e10c244a01b53e3
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 01:25:55 2013 -0600

    Removed uses of ImageMagick, and just scaled images

commit 0671d0f2f364dbb33d1e98cc0578b88b0199955d
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 01:18:35 2013 -0600

    Broken image links appear, but image won't upload (ImageMagic error)

commit 54fe27a7df5908e1bfc5a6b672b60763ad1f93ba
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 01:01:00 2013 -0600

    Added profile picture to User list and to show user

commit 90f50d7d45dfa1d5a1f6cb1191e38eddcac09cc4
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:57:14 2013 -0600

    Added field to user#form

commit 672055faa2d94ecff73d6b08966264226bd32ade
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:56:12 2013 -0600

    Fixed typo (; => :)

commit 918f7d34676faac5e81e33fd6e0343231fd58daa
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:52:00 2013 -0600

    Added verification for pic attachment in model

commit b9b3e7f8eb4d885a26c9d5c28d1265ad4b19192b
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:48:47 2013 -0600

    rake db:migrate AddPicPaperclip

commit 40af7f81f292e40a37d3cc3cc69f5bbcbf9710f2
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:47:35 2013 -0600

    Modified migration file to add.remove 4 columns, file name, type, size, and date added

commit 724672702dd253cce985c323b5ae228896f04225
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:45:02 2013 -0600

    generated a migration for profile pictures

commit d94a35b5920c306db93687f5a34f4adb152e3bf3
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Mon Apr 1 00:42:39 2013 -0600

    Added paperclip in Gemfile and environment