Merged from branch 'user_login.' Users can register and login. Currently no access control is in place, but all actions with the session are in place. Squashed commit of the following:

commit ab313263dc65ef5c0cb80869adc59a510d9f9ea1
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:37:32 2013 -0600

    commented out admin test (will add later)

commit 99cc3967b8b5cc23cb3eddb9682c3fd080c2ae26
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:35:59 2013 -0600

    Updated session tests and user fixtures

commit 06b8d4999e406e92ed20adbc90c5787240a527f5
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:23:49 2013 -0600

    Corrected bug when logging out (wrong http method)

commit 83e272443b67c776f9d0b7d703f61c29f61f5994
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:17:42 2013 -0600

    Put "new" html in "create" html. Swapped content

commit e1c20a9755e9095ee8d853f6be4cd2568eb9bc48
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:15:56 2013 -0600

    Modified Header for registration

commit 412303ed527263d95904e57f462cc1b7549cc690
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:15:39 2013 -0600

    Generate links to login and register in application

commit cd2be32cb13ffa44c212e050dd5612b906487754
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:05:51 2013 -0600

    Modified routes to have admin/index be default for admin, and capture sessions urls

commit fdc39ab62a1604c46f5dac4bb08669e460a1aaf7
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 22:02:52 2013 -0600

    Made admin index show dummy page that says username

commit 624496796bbc98af2811063346def8fe5d1f0f58
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:51:24 2013 -0600

    Added logout function (sessions#destroy) that redirects to Home with notice of logout

commit cd61ae0435e0a5bf8f2dd39791350d29e749dd08
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:50:48 2013 -0600

    Added a notice hook to home page

commit 0a6115b000fe8bbaa3fb66570f0de7dfb7b00813
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:48:48 2013 -0600

    Created a sessions/create layout (Login page)

commit 197766c652e13894b0e53fcd147495db87c738f0
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:40:03 2013 -0600

    add session/create to redirect to admin if user exists or back to login if error

commit bca3649e1083be5e6f886ab7628141ac8a07a14f
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:33:02 2013 -0600

    ran 'rails generate controller admin index'

commit 16e88f5ea412b37459a0c0deaa8967020b2f32f5
Author: Joshua Lamson <jlamson@mymail.mines.edu>
Date:   Sun Mar 31 21:31:55 2013 -0600

    Ran 'rails generate controller sessions new create destroy'