Windows Fix #2 + AMD Support

[spacenick]

Sorry, my previous fix was not supporting spaces in directory names
(just switched to Windows so I forgot basic cmd stuff, anyway), so I
wrapped dirname with ""

Updated package.json to fetch latest Handlebars (rc1), which offers AMD
support and is probably more stable than beta

Added amd support, just add amd:true to your gruntfile

handlebars: {
  all: {
    src: 'fixtures',
    dest: 'fixtures/output/templates.js',
    amd:true
  }
}