remove dependency on Rails for calling .to_query on hash

lib/google_directions.rb

@@ -96,3 +96,20 @@ def transcribe(location)
     end
 
 end
+
+class Hash
+
+  def to_query
+    params = ''
+
+    each do |k, v|
+      params << "#{k}=#{v}&"
+    end
+
+    params.chop! # trailing &
+    params
+  end unless method_defined? :to_query
+
+end
+
+