Add bower_components as it contains the resources used by github pages.

bower_components/handlebars/handlebars-source.gemspec

@@ -0,0 +1,22 @@
+# -*- encoding: utf-8 -*-
+require 'json'
+
+package = JSON.parse(File.read('bower.json'))
+
+Gem::Specification.new do |gem|
+  gem.name          = "handlebars-source"
+  gem.authors       = ["Yehuda Katz"]
+  gem.email         = ["wycats@gmail.com"]
+  gem.date          = Time.now.strftime("%Y-%m-%d")
+  gem.description   = %q{Handlebars.js source code wrapper for (pre)compilation gems.}
+  gem.summary       = %q{Handlebars.js source code wrapper}
+  gem.homepage      = "https://github.com/wycats/handlebars.js/"
+  gem.version       = package["version"].sub "-", "."
+  gem.license       = "MIT"
+
+  gem.files = [
+    'handlebars.js',
+    'handlebars.runtime.js',
+    'lib/handlebars/source.rb'
+  ]
+end