Superadmin feature (#79)

* Superadmin feature (self deletion is already a feature

* Remove schema.rb from git

* PR feedback

db/migrate/20161124062115_add_superadmin_to_admins.rb

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+class AddSuperadminToAdmins < ActiveRecord::Migration
+  def change
+    add_column :admins, :superadmin, :boolean
+  end
+end

features/admins/super_admin_edit_admins.feature

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+Feature: Super admin deletes an admin
+
+  As a super admin
+  So that I can control other admins
+  I want to be able to delete them
+
+  Background:
+    Given the following admin exists
+      | name  | email                  | password | superadmin |
+  	  | Bob   | supreme_ruler@aol.com  | ilikcats | true       |
+  	  | Carol | abc@abc.com            | abc      | false      |
+   	And I am on the login page
+
+  Scenario: Super admin successfully deletes another admin
+    When I log in as an admin with email "[email protected]"
+    And PENDING: I press "Edit Admins"
+    And PENDING: I follow "delete_Carol"
+    Then PENDING: I should not see "Carol"
+
+  Scenario: Regular admin cannot access the super admin page
+    When I log in as an admin with email "[email protected]"
+    Then PENDING: I should not see "Edit Admins"
+
+  Scenario: Super Admin successfully transfers super admin ability to another
+    When I log in as an admin with email "[email protected]"
+    And PENDING: I press "Edit Admins"
+    And PENDING: I choose "transfer_Carol"
+    And PENDING: I press "Transfer"
+    Then PENDING: I should see "Admin powers transferred!"
+    And PENDING: I should be on the admin home page
+    And PENDING: I should not see "Edit Admins"
+