remove poltergeist gem, no longer used

Gemfile

@@ -70,7 +70,6 @@ group :test do
   gem 'rack-test',                      require: 'rack/test'
   gem 'mocha',                          require: nil
   gem 'rake',                           require: nil
-  gem 'poltergeist'
   gem 'capybara',                       require: nil #, '2.10.1',     require: nil
   gem 'rack_session_access',            require: nil
   gem 'webmock', '3.5.1',               require: nil
@@ -80,5 +79,4 @@ group :test do
   gem 'simplecov',                      require: nil
   gem 'm'
   gem 'apparition'
-  gem 'poltergeist', require: nil
 end

Gemfile.lock

@@ -43,7 +43,6 @@ GEM
       xpath (~> 3.2)
     certified (1.0.0)
     climate_control (0.2.0)
-    cliver (0.3.2)
     coderay (1.1.2)
     concurrent-ruby (1.1.5)
     connection_pool (2.2.2)
@@ -164,10 +163,6 @@ GEM
     ox (2.11.0)
     paypal-recurring (1.1.0)
     pg (1.1.4)
-    poltergeist (1.18.1)
-      capybara (>= 2.1, < 4)
-      cliver (~> 0.3.1)
-      websocket-driver (>= 0.2.0)
     progress (3.5.2)
     pry (0.12.2)
       coderay (~> 1.1.0)
@@ -331,7 +326,6 @@ DEPENDENCIES
   msgpack
   paypal-recurring
   pg
-  poltergeist
   pry
   pry-byebug
   puma