Specify file manifest programatically

Manual manifest specified lib/faraday/builder.rb, which was removed.

faraday.gemspec

@@ -1,83 +1,25 @@
-Gem::Specification.new do |s|
-  s.specification_version = 2 if s.respond_to? :specification_version=
-  s.required_rubygems_version = Gem::Requirement.new(">= 1.3.5") if s.respond_to? :required_rubygems_version=
+Gem::Specification.new do |spec|
+  spec.specification_version = 2 if spec.respond_to? :specification_version=
+  spec.required_rubygems_version = Gem::Requirement.new(">= 1.3.5") if spec.respond_to? :required_rubygems_version=
 
-  s.name    = 'faraday'
-  s.version = '0.9.0.pre'
+  spec.name    = 'faraday'
+  spec.version = '0.9.0.pre'
 
-  s.summary     = "HTTP/REST API client library."
-  # TODO: s.description
+  spec.summary     = "HTTP/REST API client library."
+  # TODO: spec.description
 
-  s.authors  = ["Rick Olson"]
-  s.email    = 'technoweenie@gmail.com'
-  s.homepage = 'https://github.com/technoweenie/faraday'
-  s.licenses = ['MIT']
+  spec.authors  = ["Rick Olson"]
+  spec.email    = 'technoweenie@gmail.com'
+  spec.homepage = 'https://github.com/technoweenie/faraday'
+  spec.licenses = ['MIT']
 
-  s.add_dependency 'multipart-post', '~> 1.1'
-  s.add_development_dependency 'rake'
-  s.add_development_dependency 'simplecov'
+  spec.add_dependency 'multipart-post', '~> 1.1'
+  spec.add_development_dependency 'rake'
+  spec.add_development_dependency 'simplecov'
 
   # = MANIFEST =
-  s.files = %w[
-    Gemfile
-    LICENSE.md
-    README.md
-    Rakefile
-    faraday.gemspec
-    lib/faraday.rb
-    lib/faraday/adapter.rb
-    lib/faraday/adapter/em_http.rb
-    lib/faraday/adapter/em_synchrony.rb
-    lib/faraday/adapter/em_synchrony/parallel_manager.rb
-    lib/faraday/adapter/excon.rb
-    lib/faraday/adapter/httpclient.rb
-    lib/faraday/adapter/net_http.rb
-    lib/faraday/adapter/net_http_persistent.rb
-    lib/faraday/adapter/patron.rb
-    lib/faraday/adapter/rack.rb
-    lib/faraday/adapter/test.rb
-    lib/faraday/adapter/typhoeus.rb
-    lib/faraday/builder.rb
-    lib/faraday/connection.rb
-    lib/faraday/error.rb
-    lib/faraday/middleware.rb
-    lib/faraday/request.rb
-    lib/faraday/request/authorization.rb
-    lib/faraday/request/basic_authentication.rb
-    lib/faraday/request/multipart.rb
-    lib/faraday/request/retry.rb
-    lib/faraday/request/token_authentication.rb
-    lib/faraday/request/url_encoded.rb
-    lib/faraday/response.rb
-    lib/faraday/response/logger.rb
-    lib/faraday/response/raise_error.rb
-    lib/faraday/upload_io.rb
-    lib/faraday/utils.rb
-    script/test
-    test/adapters/default_test.rb
-    test/adapters/em_http_test.rb
-    test/adapters/em_synchrony_test.rb
-    test/adapters/excon_test.rb
-    test/adapters/httpclient_test.rb
-    test/adapters/integration.rb
-    test/adapters/logger_test.rb
-    test/adapters/net_http_persistent_test.rb
-    test/adapters/net_http_test.rb
-    test/adapters/patron_test.rb
-    test/adapters/rack_test.rb
-    test/adapters/test_middleware_test.rb
-    test/adapters/typhoeus_test.rb
-    test/authentication_middleware_test.rb
-    test/connection_test.rb
-    test/env_test.rb
-    test/helper.rb
-    test/live_server.rb
-    test/middleware/retry_test.rb
-    test/middleware_stack_test.rb
-    test/request_middleware_test.rb
-    test/response_middleware_test.rb
-  ]
-  # = MANIFEST =
-
-  s.test_files = s.files.select { |path| path =~ %r{^test/*/.+\.rb} }
+  spec.files = %w(Gemfile LICENSE.md README.md Rakefile faraday.gemspec script/test)
+  spec.files += Dir.glob("lib/**/*.rb")
+  spec.files += Dir.glob("test/**/*.rb")
+  spec.test_files = Dir.glob("test/**/*.rb")
 end