add collection button and helpers

app/helpers/collections_helper.rb

+module CollectionsHelper
+
+  ##
+  # x objetos educacionais
+  def collection_length(collection)
+    "#{collection.learning_objects.count} objetos educacionais nessa coleção"
+  end
+
+end
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app/views/learning_objects/_add_to_collection_btn.html.erb

+<a href="#" id="add_to_collection">Adicionar as coleções</a>
+
+<div id="collections_list_popover" style="display: none">
+  <ul>
+    <% collections.each do |c| %>
+    <li><%= c.name %></li>
+    <% end %>
+  </ul>
+</div>
+
+<div id="collections_list_popover_title" style="display: none">
+  Adicione esse objeto a uma coleção
+</div>
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