Replace poltergeist with selenium-webdriver

Gemfile

@@ -76,8 +76,8 @@ group :test do
   gem 'coveralls', '~> 0.8.21', require: false
   gem 'database_cleaner', '~> 1.6.1'
   gem 'email_spec', '~> 2.1.0'
-  gem 'poltergeist', '~> 1.17.0'
   gem 'rspec-rails', '~> 3.6'
+  gem 'selenium-webdriver', '~> 3.10'
 end
 
 group :development do

Gemfile.lock

@@ -94,12 +94,13 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (>= 2.0, < 4.0)
+    childprocess (0.8.0)
+      ffi (~> 1.0, >= 1.0.11)
     chronic (0.10.2)
     ckeditor (4.2.4)
       cocaine
       orm_adapter (~> 0.5.0)
     climate_control (0.2.0)
-    cliver (0.3.2)
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
     cocoon (1.2.11)
@@ -161,6 +162,7 @@ GEM
       i18n (>= 0.7)
     faraday (0.12.1)
       multipart-post (>= 1.2, < 3)
+    ffi (1.9.23)
     foundation-rails (6.2.4.0)
       railties (>= 3.1.0)
       sass (>= 3.3.0, < 3.5)
@@ -310,10 +312,6 @@ GEM
       activerecord (>= 4.2)
       activesupport (>= 4.2)
       arel (>= 6)
-    poltergeist (1.17.0)
-      capybara (~> 2.1)
-      cliver (~> 0.3.1)
-      websocket-driver (>= 0.2.0)
     powerpack (0.1.1)
     public_suffix (3.0.1)
     quiet_assets (1.1.0)
@@ -391,6 +389,7 @@ GEM
     rubocop-rspec (1.22.1)
       rubocop (>= 0.52.1)
     ruby-progressbar (1.9.0)
+    rubyzip (1.2.1)
     rvm1-capistrano3 (1.4.0)
       capistrano (~> 3.0)
       sshkit (>= 1.2)
@@ -414,6 +413,9 @@ GEM
     scss_lint (0.54.0)
       rake (>= 0.9, < 13)
       sass (~> 3.4.20)
+    selenium-webdriver (3.10.0)
+      childprocess (~> 0.5)
+      rubyzip (~> 1.2)
     simplecov (0.14.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
@@ -478,9 +480,6 @@ GEM
       activemodel (>= 4.2)
       debug_inspector
       railties (>= 4.2)
-    websocket-driver (0.7.0)
-      websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
     whenever (0.10.0)
       chronic (>= 0.6.3)
     xpath (3.0.0)
@@ -542,7 +541,6 @@ DEPENDENCIES
   paranoia (~> 2.4.0)
   pg (~> 0.21.0)
   pg_search (~> 2.0.1)
-  poltergeist (~> 1.17.0)
   quiet_assets (~> 1.1.0)
   rails (= 4.2.10)
   rails-assets-leaflet!
@@ -558,6 +556,7 @@ DEPENDENCIES
   sass-rails (~> 5.0, >= 5.0.4)
   savon (~> 2.11.1)
   scss_lint (~> 0.54.0)
+  selenium-webdriver (~> 3.10)
   sitemap_generator (~> 6.0.1)
   social-share-button (~> 1.1)
   spring (~> 2.0.1)
@@ -571,4 +570,4 @@ DEPENDENCIES
   whenever (~> 0.10.0)
 
 BUNDLED WITH
-   1.16.0
+   1.16.1