Adding public following and followers pages, fix #3

app/views/accounts/followers.html.haml

@@ -0,0 +1,14 @@
+- content_for :page_title do
+  People who follow
+  = display_name(@account)
+
+= render partial: 'header'
+
+.accounts-grid
+  - @followers.each do |f|
+    = render partial: 'grid_card', locals: { account: f }
+
+  - if @followers.empty?
+    = render partial: 'nothing_here'
+
+= will_paginate @followers, pagination_options