Reduce mime-types gem memory usage

This is based on mime-types/ruby-mime-types#96, and some kind words from Alex Burkhart. By using the columnar store in the mime types gem we should be able to save 10-20MB of memory per ruby process.
Aperta-project · Jan 25, 2017 · 86c17c3 · 86c17c3
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diff --git a/Gemfile b/Gemfile
@@ -38,6 +38,7 @@ gem 'kaminari'
 gem 'lograge'
 gem 'mail_safe', require: false
 gem 'migration_data'
+gem 'mime-types', '~> 2.99', require: 'mime/types/columnar' # memory savings, we can also updgrade to 3.x
 gem 'mini_magick'
 gem 'newrelic_rpm'
 gem 'nokogiri'

diff --git a/Gemfile.lock b/Gemfile.lock
@@ -744,6 +744,7 @@ DEPENDENCIES
   lograge
   mail_safe
   migration_data
+  mime-types (~> 2.99)
   mini_magick
   newrelic_rpm
   nokogiri