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diff --git a/vendor/twbs/bootstrap-sass/tasks/converter.rb b/vendor/twbs/bootstrap-sass/tasks/converter.rb
new file mode 100644
index 000000000..10091f711
--- /dev/null
+++ b/vendor/twbs/bootstrap-sass/tasks/converter.rb
@@ -0,0 +1,80 @@
+# coding: utf-8
+# Based on convert script from vwall/compass-twitter-bootstrap gem.
+# https://github.com/vwall/compass-twitter-bootstrap/blob/master/build/convert.rb
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this work except in compliance with the License.
+# You may obtain a copy of the License in the LICENSE file, or at:
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'open-uri'
+require 'json'
+require 'strscan'
+require 'forwardable'
+require 'term/ansicolor'
+require 'fileutils'
+
+require_relative 'converter/fonts_conversion'
+require_relative 'converter/less_conversion'
+require_relative 'converter/js_conversion'
+require_relative 'converter/logger'
+require_relative 'converter/network'
+
+class Converter
+  extend Forwardable
+  include Network
+  include LessConversion
+  include JsConversion
+  include FontsConversion
+
+  def initialize(repo: 'twbs/bootstrap', branch: 'master', save_to: {}, cache_path: 'tmp/converter-cache-bootstrap')
+    @logger     = Logger.new
+    @repo       = repo
+    @branch     = branch || 'master'
+    @branch_sha = get_branch_sha
+    @cache_path = cache_path
+    @repo_url   = "https://github.com/#@repo"
+    @save_to    = {
+        js:    'assets/javascripts/bootstrap',
+        scss:  'assets/stylesheets/bootstrap',
+        fonts: 'assets/fonts/bootstrap'}.merge(save_to)
+  end
+
+  def_delegators :@logger, :log, :log_status, :log_processing, :log_transform, :log_file_info, :log_processed, :log_http_get_file, :log_http_get_files, :silence_log
+
+  def process_bootstrap
+    log_status "Convert Bootstrap LESS to Sass"
+    puts " repo   : #@repo_url"
+    puts " branch : #@branch_sha #@repo_url/tree/#@branch"
+    puts " save to: #{@save_to.to_json}"
+    puts " twbs cache: #{@cache_path}"
+    puts '-' * 60
+
+    @save_to.each { |_, v| FileUtils.mkdir_p(v) }
+
+    process_font_assets
+    process_stylesheet_assets
+    process_javascript_assets
+    store_version
+  end
+
+  def save_file(path, content, mode='w')
+    dir = File.dirname(path)
+    FileUtils.mkdir_p(dir) unless File.directory?(dir)
+    File.open(path, mode) { |file| file.write(content) }
+  end
+
+  # Update version.rb file with BOOTSTRAP_SHA
+  def store_version
+    path    = 'lib/bootstrap-sass/version.rb'
+    content = File.read(path).sub(/BOOTSTRAP_SHA\s*=\s*['"][\w]+['"]/, "BOOTSTRAP_SHA = '#@branch_sha'")
+    File.open(path, 'w') { |f| f.write(content) }
+  end
+end