Add a init command

Resolves #129 by adding a generator following the best practices
on the wiki.

lib/itamae.rb

@@ -12,7 +12,9 @@
 require "itamae/config"
 require "itamae/ext"
 
+require "itamae/generators"
+require "itamae/generators/project"
+
 module Itamae
   # Your code goes here...
 end
-

lib/itamae/cli.rb

@@ -71,5 +71,13 @@ def docker(*recipe_files)
     def version
       puts "Itamae v#{Itamae::VERSION}"
     end
+
+    desc "init NAME", "Create a new project"
+    def init(name)
+      generator = Generators::Project.new
+      generator.destination_root = name
+      generator.invoke_all
+    end
+
   end
 end

lib/itamae/generators.rb

@@ -0,0 +1,4 @@
+module Itamae
+  module Generators
+  end
+end

lib/itamae/generators/project.rb

@@ -0,0 +1,22 @@
+require 'thor'
+require 'thor/group'
+
+module Itamae
+  module Generators
+    class Project < Thor::Group
+      include Thor::Actions
+
+      def self.source_root
+        File.dirname(__FILE__) + '/templates/project'
+      end
+
+      def copy_files
+        directory '.'
+      end
+
+      def bundle
+        run 'bundle install'
+      end
+    end
+  end
+end

lib/itamae/generators/templates/project/Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+gem 'itamae'
+# gem 'serverspec'