Added the creation of Systems to the app. Users can create a new system, and when another user is shown, it shows a list of their systems. Squashed commit of the following from branch system:

commit c16b4b98fddfccd6689afabd577a243c27ffd736
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sat May 4 19:48:55 2013 -0600

    User/show displays list of user's systems

commit 45a9bd7ebd8b2ce4bed362992f667fa296622a4a
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sat May 4 19:44:02 2013 -0600

    Include list of systems on admin page

commit 5e337f17aa06fbeb1fa0a46721302a83a16d0af8
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sat May 4 19:43:35 2013 -0600

    System stores who created it

commit af7345969527c7b95a462352c084e5b9afac29de
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Fri Apr 12 20:49:20 2013 -0600

    Modified more "public" => "is_public" and added links to a new system to index

commit 2b4556ab5a454ad6794709cff90895fdb8d34644
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Fri Apr 12 20:48:23 2013 -0600

    Made a helper file for controllers

commit bbedd1d4077b1a11f79bfc8e641d057f67cd7572
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Fri Apr 12 20:05:19 2013 -0600

    Ran migration for change column "public" to "is_public"

commit 778026e1aff3f8cae1eaeaed1af5084a98e96882
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Fri Apr 12 19:43:47 2013 -0600

    Migrated project and added foreign keys

commit 10979cc181e6df79f46c9a58d68e178a041abbb8
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Fri Apr 12 19:32:22 2013 -0600

    generated scaffold for system