[STORE] Added the default Repository::Class for convenience

Instead of:

    class MyRepository
      include Elasticsearch::Persistence::Repository
    end

    repository = MyRepository.new

you can do:

    repository = Elasticsearch::Persistence::Repository.new

The module function `new` returns an Elasticsearch::Persistence::Repository::Class instance.

Author: karmi

Diff for: elasticsearch-persistence/lib/elasticsearch/persistence.rb

@@ -5,6 +5,8 @@
 require 'elasticsearch/persistence/client'
 require 'elasticsearch/persistence/repository'
 
+require 'elasticsearch/persistence/repository/class'
+
 module Elasticsearch
   module Persistence
 

Diff for: elasticsearch-persistence/lib/elasticsearch/persistence/repository.rb

@@ -3,6 +3,10 @@ module Persistence
 
     module Repository
       include Elasticsearch::Persistence::Client
+
+      def new(options={}, &block)
+        Elasticsearch::Persistence::Repository::Class.new options, &block
+      end; module_function :new
     end
   end
 end

Diff for: elasticsearch-persistence/lib/elasticsearch/persistence/repository/class.rb

@@ -0,0 +1,18 @@
+module Elasticsearch
+  module Persistence
+    module Repository
+
+      class Class
+        include Elasticsearch::Persistence::Repository
+
+        attr_reader :options
+
+        def initialize(options={}, &block)
+          @options = options
+          block.arity < 1 ? instance_eval(&block) : block.call(self) if block_given?
+        end
+      end
+
+    end
+  end
+end

Diff for: elasticsearch-persistence/test/unit/repository_class_test.rb

@@ -0,0 +1,32 @@
+require 'test_helper'
+
+class Elasticsearch::Persistence::RepositoryClassTest < Test::Unit::TestCase
+  context "The default repository class" do
+
+    should "be created from the module" do
+      repository = Elasticsearch::Persistence::Repository.new
+      assert_instance_of Elasticsearch::Persistence::Repository::Class, repository
+    end
+
+    should "store and access the options" do
+      repository = Elasticsearch::Persistence::Repository::Class.new foo: 'bar'
+      assert_equal 'bar', repository.options[:foo]
+    end
+
+    should "instance eval a passed block" do
+      $foo = 100
+      repository = Elasticsearch::Persistence::Repository::Class.new() { $foo += 1 }
+      assert_equal 101, $foo
+    end
+
+    should "call a passed block with self" do
+      foo = 100
+      repository = Elasticsearch::Persistence::Repository::Class.new do |r|
+        assert_instance_of Elasticsearch::Persistence::Repository::Class, r
+        foo += 1
+      end
+      assert_equal 101, foo
+    end
+
+  end
+end