Add html for ClassGroup. Closes #45

Squashed commit of the following:

commit a357cdece92c8abdd2a28dd123931645da7fa6f1
Merge: d15217c 66a4fa1
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Fri Sep 12 00:25:53 2014 -0500

    Fix merge conflicts

commit d15217cfab8c04104d8d0646c82d2f69c439ea56
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Fri Sep 12 00:22:20 2014 -0500

    Move html from class_groups/index.html to memberships index - proper location

commit e0175ef4b38396a86cb10897b0eb75826451b7b7
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 23:43:32 2014 -0500

    added link to edit students from class_groups index

commit 0baa2f77329930bacf6a870bfb594ac4c4670030
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 18:00:54 2014 -0500

    Fixed minor gemfile spacing

commit 9b985969617733301ffa8c7f5ea25f577831736a
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 16:40:14 2014 -0500

    Edit navbar to display our links, moved gravatar to left of menu

commit c0d1dc9784078519f1f23fe003b0aaa849d74c5a
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 16:39:25 2014 -0500

    Add Student question set selection template with @class_groups placeholder for question set until it is ready

commit c1270ce586633bd29d1e7d4e7c893144d9eee9e4
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 16:16:06 2014 -0500

    Add class_groups partials

commit e4c421b8c822a9221fb69280af770c1d6ed5cedc
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 12:30:49 2014 -0500

    Add student class views and class question set views

commit 45cadc0d2b8a3a7efbf5422c13bd3602f62dca5a
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 12:03:08 2014 -0500

    Create Class template html on class_groups/index.html.erb

commit 66a4fa1197e469aa3e4f9078aa770423d5fc3c01
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 17:19:21 2014 -0500

    Rearrange placement of the student class_group template code to be housed inside of the main div for cohesiveness

commit 1b6a58ae786cb4019ba07ab17f7de20e6582e4ed
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 16:39:25 2014 -0500

    Add Student question set selection template with @class_groups placeholder for question set until it is ready

commit 9bb24ffa230393b59e9528424e736ca3a95805cc
Merge: 29ac405 7ac4d35
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 12:43:05 2014 -0500

    Resolved add-templates branch merge conflict for index.html.erb file

commit 29ac405bab5d77ea857f10c81eb4bd806bbd32a3
Author: Randy Davis <randy_davis@outlook.com>
Date:   Thu Sep 11 12:30:49 2014 -0500

    Add student class views and class question set views

commit 7ac4d35fd6900bf4bef3cf82c3696b6a44112148
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 12:03:08 2014 -0500

    Create Class template html on class_groups/index.html.erb

commit 88b05a38f55268a6e3d3efca0a91d63f70e54cd1
Author: Allison Zadrozny <allison@zadrozny.com>
Date:   Thu Sep 11 09:42:27 2014 -0500

    Delete new_group_class_path link since it doesn't exist