Remove all windows-illegal characters from filenames

lib/rspec_api_documentation/views/markup_example.rb

@@ -23,7 +23,8 @@ def dirname
       end
 
       def filename
-        basename = description.downcase.gsub(/\s+/, '_').gsub(Pathname::SEPARATOR_PAT, '')
+        special_chars = /[<>:"\/\\|?*]/
+        basename = description.downcase.gsub(/\s+/, '_').gsub(special_chars, '')
         basename = Digest::MD5.new.update(description).to_s if basename.blank?
         "#{basename}.#{extension}"
       end

spec/views/html_example_spec.rb

@@ -4,7 +4,8 @@
 describe RspecApiDocumentation::Views::HtmlExample do
   let(:metadata) { { :resource_name => "Orders" } }
   let(:group) { RSpec::Core::ExampleGroup.describe("Orders", metadata) }
-  let(:rspec_example) { group.example("Ordering a cup of coffee") {} }
+  let(:description) { "Ordering a cup of coffee" }
+  let(:rspec_example) { group.example(description) {} }
   let(:rad_example) do
     RspecApiDocumentation::Example.new(rspec_example, configuration)
   end
@@ -19,6 +20,14 @@
     expect(html_example.filename).to eq("ordering_a_cup_of_coffee.html")
   end
 
+  context "when description contains special characters for Windows OS" do
+    let(:description) { 'foo<>:"/\|?*bar' }
+
+    it "removes them" do
+      expect(html_example.filename).to eq("foobar.html")
+    end
+  end
+
   describe "multi charctor example name" do
     let(:metadata) { { :resource_name => "オーダ" } }
     let(:label) { "Coffee / Teaが順番で並んでいること" }