Remove support for exclude_paths

Refactor #files_to_inspect a little in the course of doing so.

@@ -61,30 +61,18 @@ def results
 @results ||= Nokogiri::XML(csslint_xml)
 end
 
-def build_files_with_exclusions(exclusions)
-files = Dir.glob("**/*.css")
-files.reject { |f| exclusions.include?(f) }
-end
-
-def build_files_with_inclusions(inclusions)
-inclusions.map do |include_path|
-if include_path =~ %r{/$}
-Dir.glob("#{include_path}/**/*.css")
-else
-include_path if include_path =~ /\.css$/
-end
-end.flatten.compact
-end
-
 def csslint_xml
 `csslint --format=checkstyle-xml #{files_to_inspect.join(" ")}`
 end
 
 def files_to_inspect
-if @engine_config["include_paths"]
-build_files_with_inclusions(@engine_config["include_paths"])
-else
-build_files_with_exclusions(@engine_config["exclude_paths"] || [])
+include_paths = @engine_config["include_paths"] || ["./"]
+include_paths.each_with_object([]) do |path, out|
+if path.end_with?("/")
+out.concat(Dir.glob("#{path}**/*.css"))
+elsif path.end_with?(".css")
+out << path
+end
 end
 end
 end

@@ -32,20 +32,6 @@ module Engine
 expect{ lint.run }.not_to output(/good\.css/).to_stdout
 end
 
-describe "with exclude_paths" do
-let(:engine_config) { {"exclude_paths" => %w(excluded.css)} }
-
-before do
-create_source_file("not_excluded.css", "p { margin: 5px }")
-create_source_file("excluded.css", id_selector_content)
-end
-
-it "excludes all matching paths" do
-expect{ lint.run }.not_to \
-output(/Don't use IDs in selectors./).to_stdout
-end
-end
-
 describe "with include_paths" do
 let(:engine_config) {
 {"include_paths" => %w(included.css included_dir/ config.yml)}
@@ -79,6 +65,7 @@ module Engine
 end
 
 it "shouldn't call a top-level Dir.glob ever" do
+allow(Dir).to receive(:glob).and_call_original
 expect(Dir).not_to receive(:glob).with("**/*.css")
 expect{ lint.run }.to \
 output(/Don't use IDs in selectors./).to_stdout