Merge branch 'add_dev_update_submodules' into my_pulls

closes carlhuda#284

* add_dev_update_submodules:
  Rakefile: Add a task to easly update all submodules.

Conflicts:
	Rakefile

Rakefile

@@ -110,6 +110,38 @@ task :link_vim_conf_files do
   end
 end
 
+# Get a list of submodules
+#
+# @return [Array] of submodules
+def submodules
+  `git submodule`.split("\n").collect { |s| s.split(" ")[1] }
+end
+
+# Update a submodule
+#
+# @param [String] The submodule to update (relative path)
+# @param [String] The branch we're tracking
+def update_submodule(submodule, branch = "master")
+  Dir.chdir submodule do
+    puts
+    puts "*" * 40
+    puts "*#{"Updating #{submodule}".center(38)}*"
+    puts "*" * 40
+    puts
+    sh "git checkout #{branch}"
+    sh "git pull"
+  end
+end
+
+namespace :dev do
+  desc "Update submodules"
+  task :update_submodules do
+    submodules.each do |submodule|
+      update_submodule(submodule)
+    end
+  end
+end
+
 desc "Create necessary folders."
 task :folders do
   Janus::VIM.folders.each do |folder|