Allow editing of role in profile

app/controllers/profiles_controller.rb

@@ -100,6 +100,7 @@ class ProfilesController < Profiles::ApplicationController
       :avatar,
       :bio,
       :email,
+      :role,
       :hide_no_password,
       :hide_no_ssh_key,
       :hide_project_limit,

app/views/profiles/show.html.haml

@@ -94,6 +94,7 @@
         - else
           = f.text_field :name, label: s_('Profiles|Full name'), required: true, title: s_("Profiles|Using emojis in names seems fun, but please try to set a status message instead"), wrapper: { class: 'col-md-9 qa-full-name rspec-full-name' }, help: s_("Profiles|Enter your name, so people you know can recognize you")
         = f.text_field :id, readonly: true, label: s_('Profiles|User ID'), wrapper: { class: 'col-md-3' }
+      = f.select :role, ::User.roles.keys.map { |role| [role.titleize, role] }, {}, class: 'input-md'
 
       = render_if_exists 'profiles/email_settings', form: f
       = f.text_field :skype, class: 'input-md', placeholder: s_("Profiles|username")