Breadcrumbs

Breadcrumbs para Cuentas, Oportunidades, Notas.
Iconos incluidos

<ol class="breadcrumb">
          <li><span class="glyphicon glyphicon-heart"></span>
Cuentas</li>
</ol>
Added Observers & Opportunity Field Audit

- Installed rails observers (they were removed from rails 4.0)
https://github.com/rails/rails-observers
gem 'rails-observers'

http://api.rubyonrails.org/v3.2.5/classes/ActiveRecord/Observer.html

- Created table to store Opportunity field changes.
Using Active Model Dirty to get previous value
http://api.rubyonrails.org/classes/ActiveModel/Dirty.html