Remove needless Packnga dependency

Rakefile

@@ -12,9 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require "rubygems"
 require "bundler/gem_helper"
-require "packnga"
 
 base_dir = File.join(File.dirname(__FILE__))
 
@@ -26,14 +24,6 @@ end
 helper.install
 spec = helper.gemspec
 
-Packnga::DocumentTask.new(spec) do |task|
-  task.original_language = "en"
-  task.translate_language = "ja"
-end
-
-Packnga::ReleaseTask.new(spec) do
-end
-
 # desc "Run tests"
 # task :test do
 #   ruby("test/run-test.rb")

jekyll-jupyter-notebook.gemspec

@@ -43,7 +43,5 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency("bundler")
   spec.add_development_dependency("rake")
-  spec.add_development_dependency("test-unit")
-  spec.add_development_dependency("packnga")
   spec.add_development_dependency("kramdown")
 end