Hyrax 2.1 upgrade (samvera#1529)

* update to hyrax 2.1 proper

* solr_wrapper update, fixes the fact that apache no longer creates md5sums for releases

* dashboard layout is now called hyrax/dashboard layout

* all collections now have to have collection type

* remove mac specific ignore, prefer global ignore instead

* add spec for upgrade migration rake task

* change directory in a block so the app context is not swapped to a new directory

* fix extented

* add code comment about rack-test version

Gemfile

@@ -59,6 +59,8 @@ group :test do
   gem 'chromedriver-helper'
   gem 'database_cleaner'
   gem 'factory_girl_rails'
+  # rack-test >= 0.71 does not work with older Capybara versions (< 2.17). See #214 for more details
+  gem 'rack-test', '0.7.0'
   gem 'rails-controller-testing'
   gem 'selenium-webdriver'
   gem 'webmock'
@@ -79,7 +81,7 @@ end
 gem 'blacklight', '~> 6.7'
 gem 'blacklight_oai_provider', '~> 6.0'
 
-gem 'hyrax', '2.0.2'
+gem 'hyrax', '2.1.0'
 gem 'rsolr', '~> 2.0'
 
 gem 'devise'