[RAILS] Updated the application templates to work with README.md instead of README.rdoc

Current Rails version uses `README.md` instead of the old `.rdoc` file,
and the templates have not been updated to reflect that.

This patch changes both the logic to insert content into the README file
and the check whether a previous template has been already run.

Related: elastic#668

Author: karmi

elasticsearch-rails/lib/rails/templates/01-basic.rb

@@ -80,18 +80,18 @@
 say_status  "README", "Adding Readme...\n", :yellow
 puts        '-'*80, ''; sleep 0.25
 
-remove_file 'README.rdoc'
+remove_file 'README.md'
 
-create_file 'README.rdoc', <<-README
-= Ruby on Rails and Elasticsearch: Example application
+create_file 'README.md', <<-README
+# Ruby on Rails and Elasticsearch: Example application
 
 This application is an example of integrating the {Elasticsearch}[http://www.elasticsearch.org]
 search engine with the {Ruby On Rails}[http://rubyonrails.org] web framework.
 
 It has been generated by application templates available at
 https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-rails/lib/rails/templates.
 
-== [1] Basic
+## [1] Basic
 
 The `basic` version provides a simple integration for a simple Rails model, `Article`, showing how
 to include the search engine support in your model, automatically index changes to records,

elasticsearch-rails/lib/rails/templates/02-pretty.rb

@@ -1,6 +1,6 @@
 # $ rails new searchapp --skip --skip-bundle --template https://raw.github.com/elasticsearch/elasticsearch-rails/master/elasticsearch-rails/lib/rails/templates/02-pretty.rb
 
-unless File.read('README.rdoc').include? '== [1] Basic'
+unless File.read('README.md').include? '## [1] Basic'
   say_status  "ERROR", "You have to run the 01-basic.rb template first.", :red
   exit(1)
 end
@@ -9,9 +9,9 @@
 say_status  "README", "Updating Readme...\n", :yellow
 puts        '-'*80, ''; sleep 0.25
 
-append_to_file 'README.rdoc', <<-README
+append_to_file 'README.md', <<-README
 
-== [2] Pretty
+## [2] Pretty
 
 The `pretty` template builds on the `basic` version and brings couple of improvements:
 
@@ -22,7 +22,7 @@
 
 README
 
-git add:    "README.rdoc"
+git add:    "README.md"
 git commit: "-m '[02] Updated the application README'"
 
 # ----- Update application.rb ---------------------------------------------------------------------

elasticsearch-rails/lib/rails/templates/03-expert.rb

@@ -1,6 +1,6 @@
 #     $ rails new searchapp --skip --skip-bundle --template https://raw.github.com/elasticsearch/elasticsearch-rails/master/elasticsearch-rails/lib/rails/templates/03-expert.rb
 
-unless File.read('README.md').include? '== [2] Pretty'
+unless File.read('README.md').include? '## [2] Pretty'
   say_status  "ERROR", "You have to run the 01-basic.rb and 02-pretty.rb templates first.", :red
   exit(1)
 end

elasticsearch-rails/lib/rails/templates/04-dsl.rb

@@ -1,21 +1,21 @@
 #     $ rails new searchapp --skip --skip-bundle --template https://raw.githubusercontent.com/elastic/elasticsearch-rails/master/elasticsearch-rails/lib/rails/templates/04-dsl.rb
 
-unless File.read('README.rdoc').include? '== [3] Expert'
+unless File.read('README.md').include? '## [3] Expert'
   say_status  "ERROR", "You have to run the 01-basic.rb, 02-pretty.rb and 03-expert.rb templates first.", :red
   exit(1)
 end
 
-append_to_file 'README.rdoc', <<-README
+append_to_file 'README.md', <<-README
 
-== [4] DSL
+## [4] DSL
 
 The `dsl` template refactors the search definition in SearchController#index
 to use the [`elasticsearch-dsl`](https://github.com/elastic/elasticsearch-ruby/tree/dsl/elasticsearch-dsl)
 Rubygem for better expresivity and readability of the code.
 
 README
 
-git add:    "README.rdoc"
+git add:    "README.md"
 git commit: "-m '[03] Updated the application README'"
 
 run 'rm -f app/assets/stylesheets/*.scss'

elasticsearch-rails/lib/rails/templates/05-settings-files.rb

@@ -2,16 +2,16 @@
 
 # (See: 01-basic.rb, 02-pretty.rb, 03-expert.rb, 04-dsl.rb)
 
-append_to_file 'README.rdoc', <<-README
+append_to_file 'README.md', <<-README
 
-== [5] Settings Files
+## [5] Settings Files
 
 The `settings-files` template refactors the `Searchable` module to load the index settings
 from an external file.
 
 README
 
-git add:    "README.rdoc"
+git add:    "README.md"
 git commit: "-m '[05] Updated the application README'"
 
 # ----- Setup the Searchable module to load settings from config/elasticsearch/articles_settings.json