#25586 -  Change base module to simple_breadcrumbs and update test coverage in regards to name change

This pull request fixes two main issues in response to the recent name change from 'has_breadcrumb' to 'simple_breadcrumbs'.  The base module, 'lib/has_breadcrumbs.rb', which loads the gem and railtie was not being called as gem was looking for a base module of 'lib/simple_breadcrumbs'.  Changing this module's name corrected the issue.

In addition, the a couple places in the specs needed updated to reflect the name change as well as they were looking for the old name vs. the updated one.

[#25586](https://squaremouth.lighthouseapp.com/projects/63460-viper/tickets/25586-change-base-module-in-simple_breadcrumbs-to-simple_breadcrumbs)