add test for helpers in external files

features/helpers_external.feature

@@ -0,0 +1,6 @@
+Feature: Helpers in external files
+
+  Scenario: Hello Helper
+    Given the Server is running at "external-helpers"
+    Then going to "/index.html" should not raise an exception
+    And I should see "Hello World"

fixtures/external-helpers/config.rb

@@ -0,0 +1,4 @@
+require "lib/hello_helper"
+helpers HelloHelper
+
+page "/", :layout => false

fixtures/external-helpers/lib/hello_helper.rb

@@ -0,0 +1,5 @@
+module HelloHelper
+  def hello
+    "Hello World"
+  end
+end

fixtures/external-helpers/source/index.html.erb

@@ -0,0 +1 @@
+<%= hello %>

lib/middleman/core_extensions/extensions.rb

@@ -94,6 +94,9 @@ module Middleman::CoreExtensions::Extensions
       
       run_hook :before_configuration
     
+      # Search the root of the project for required files
+      $LOAD_PATH.unshift(root)
+      
       # Check for and evaluate local configuration
       local_config = File.join(root, "config.rb")
       if File.exists? local_config