Remove the selenium-webdriver gem (unused)

Gemfile

@@ -97,7 +97,6 @@ group :test do
   gem 'launchy'
   gem 'factory_girl'
   gem 'database_cleaner'
-  gem 'selenium-webdriver'
   gem 'webmock'
   gem 'shoulda-matchers', require: false
   gem 'simplecov', require: false

Gemfile.lock

@@ -101,8 +101,6 @@ GEM
       mime-types (>= 1.16)
       mimemagic (>= 0.3.0)
     chartkick (2.2.1)
-    childprocess (0.5.9)
-      ffi (~> 1.0, >= 1.0.11)
     clamav-client (3.1.0)
     cliver (0.3.2)
     coderay (1.1.1)
@@ -536,10 +534,6 @@ GEM
     securecompare (1.0.0)
     select2-rails (4.0.3)
       thor (~> 0.14)
-    selenium-webdriver (3.0.3)
-      childprocess (~> 0.5)
-      rubyzip (~> 1.0)
-      websocket (~> 1.0)
     sentry-raven (2.2.0)
       faraday (>= 0.7.6, < 1.0)
     sexp_processor (4.7.0)
@@ -623,7 +617,6 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
-    websocket (1.2.3)
     websocket-driver (0.6.4)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.2)
@@ -697,7 +690,6 @@ DEPENDENCIES
   scenic
   sdoc (~> 0.4.0)
   select2-rails
-  selenium-webdriver
   sentry-raven
   shoulda-matchers
   simple_form