Add support for YAML version file

Created version YAML file and added support for the "version" Rake task.

depends on kronik3r#7
closes kronik3r#14

Rakefile

@@ -60,4 +60,15 @@ task :post do
 	if File.size(filename) > 0
 		puts "Successfully created post file. Go edit it now!"
 	end
-end
+end
+
+desc "Get the current version of Daktilo"
+task :version do
+	version_file_contents = YAML.load_file(CONFIG['version_file'])
+
+	if version_file_contents['version']
+		puts "Daktilo version #{version_file_contents['version']}."
+	else
+		puts "Could not find version file."
+	end
+end

_version.yml

@@ -0,0 +1 @@
+version: 1.0.0