Upgrade to newer version of Capybara

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

Gemfile

@@ -226,7 +226,7 @@ group :development, :test do
   gem 'rubocop', '0.28.0', require: false
   gem 'spinach-rails'
   gem "rspec-rails", '3.0.0'
-  gem "capybara", '~> 2.2.1'
+  gem "capybara", '~> 2.3'
   gem 'capybara-screenshot', '~> 1.0.0'
   gem "pry-rails"
   gem "awesome_print"

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
       columnize (~> 0.8)
       debugger-linecache (~> 1.2)
     cal-heatmap-rails (0.0.1)
-    capybara (2.2.1)
+    capybara (2.4.4)
       mime-types (>= 1.16)
       nokogiri (>= 1.3.3)
       rack (>= 1.0.0)
@@ -736,7 +736,7 @@ DEPENDENCIES
   browser (~> 0.8.0)
   byebug
   cal-heatmap-rails (~> 0.0.1)
-  capybara (~> 2.2.1)
+  capybara (~> 2.3)
   capybara-screenshot (~> 1.0.0)
   carrierwave
   charlock_holmes