Run specs on Appveyor. (#88)

Run tests on Appveyor

.rubocop.yml

@@ -1,5 +1,8 @@
 require: rubocop-rspec
 
+Layout/EndOfLine:
+  EnforcedStyle: lf
+
 Metrics/LineLength:
   Max: 120
 

appveyor.yml

@@ -0,0 +1,23 @@
+build: off
+cache:
+  - vendor/bundle
+environment:
+  matrix:
+    - RUBY_VERSION: 24
+      RAKE_TASK: spec
+    - RUBY_VERSION: 24
+      RAKE_TASK: rubocop
+    - RUBY_VERSION: 25
+      RAKE_TASK: spec
+    - RUBY_VERSION: 26
+      RAKE_TASK: spec
+install:
+  - set PATH=C:\Ruby%RUBY_VERSION%\bin;%PATH%
+  - bundle config --local path vendor/bundle
+  - bundle install
+before_test:
+  - ruby -v
+  - gem -v
+  - bundle -v
+test_script:
+  - bundle exec rake %RAKE_TASK%

webdrivers.gemspec

@@ -17,6 +17,7 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   s.require_paths = ['lib']
 
+  s.add_development_dependency 'ffi', '~> 1.0' # For selenium-webdriver on Windows
   s.add_development_dependency 'rake', '~> 10.0'
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'rubocop', '~>0.66'