Pagination improvements (#1445)

* Replace will_paginate with kaminari

* Use #page instead of #paginate in controllers

* Replace will_paginate.page_gap with pagination.truncate in i18n

* Customize kaminari views to match prior styles

* Set kaminari options to match prior behavior

* Replace will_paginate with paginate in views

Gemfile

@@ -32,6 +32,7 @@ gem 'htmlentities'
 gem 'http'
 gem 'http_accept_language'
 gem 'httplog'
+gem 'kaminari'
 gem 'link_header'
 gem 'nokogiri'
 gem 'oj'
@@ -52,7 +53,6 @@ gem 'simple_form'
 gem 'statsd-instrument'
 gem 'twitter-text'
 gem 'tzinfo-data'
-gem 'will_paginate'
 
 gem 'react-rails'
 gem 'browserify-rails'