Enable "Clone From Git" functionality for Titanium Wizards

Existing project wizards (web, Ruby, PHP) allow a ruble to define a project template referencing a Git template:

1. Create a new ruble (http://wiki.appcelerator.org/display/tis/Creating+a+new+Ruble)
2. Paste in the following code:
   

   project_template "HTML Titanium Boilerplate" do |t|

   t.type = :titanium_mobile

   t.location = "git://github.com/paulirish/html5-boilerplate.git"

   t.description = "Paul Irish's HTML5 Boilerplate (http://html5boilerplate.com/). Requires network access."

   t.replace_parameters = false

   end

3. Launch File > New > Titanium Mobile Project and progress to the template screen. Note that the template above is missing.