Implement `mkdir' task action

spec/producer/core/actions/mkdir_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+module Producer::Core
+  describe Actions::Mkdir do
+    let(:env)       { Env.new }
+    let(:path)      { 'some_path' }
+    subject(:mkdir) { Actions::Mkdir.new(env, path) }
+
+    describe '#apply' do
+      it 'creates directory on remote filesystem' do
+        expect(mkdir.fs).to receive(:mkdir).with(path)
+        mkdir.apply
+      end
+    end
+
+    describe '#path' do
+      it 'returns the path' do
+        expect(mkdir.path).to eq path
+      end
+    end
+  end
+end
+